CN107889277A - Wireless local area network communicator - Google Patents
Wireless local area network communicator Download PDFInfo
- Publication number
- CN107889277A CN107889277A CN201610868409.4A CN201610868409A CN107889277A CN 107889277 A CN107889277 A CN 107889277A CN 201610868409 A CN201610868409 A CN 201610868409A CN 107889277 A CN107889277 A CN 107889277A
- Authority
- CN
- China
- Prior art keywords
- section
- chip
- inductance
- package
- sig
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
The present invention proposes a kind of WLAN communication device, comprising:One first antenna;And a wireless transceiver, the first antenna is coupled to, to produce a non-efficient energy package and a high-effect package;Wherein, the non-efficient energy package includes one first Legacy white silk section (L STF), the long training section (L LTF) of one first tradition, one first traditional signaling message section (L SIG), one first data segment (DATA);The non-efficient energy package does not repeat the first traditional signaling message section;The high-effect package includes one second Legacy and practices section (L STF), the long training section (L LTF) of one second tradition, one second traditional signaling message section (L SIG), the second traditional signaling message section (RL SIG) repeated, a high-effect signaling section (HE SIG A), a high-effect Short Training section (HE STF), a high-effect long training section (HE LTF), one second data segment;Wherein, the wireless transceiver further includes an inductance, and the inductance is arranged in a chip.
Description
Technical field
The relevant WLAN communication device of the present invention, it is espespecially a kind of to have while support traditional package and high-effect envelope
High quality inductor design under the WLAN communication device of bag.
Background technology
With the popularization that WLAN (WLAN) uses, increasing environment, such as airport, restaurant, enterprise, very
To being in personal family, construction wlan device is all needed, such as:AP (Access Point, access point)/Router (router)
(hereinafter referred to as AP), user is allowed to be able to be connected to internet or carry out the application of Internet of Things.In order to support various answer
Required for, AP in face of the problem of be how in can in the data of the multiple STA of same time-triggered protocol (Station, website), with
And different STA possessed communication capacities are also different from, some STA only possess 802.11a/b/g communication capacity, some
STA possesses 802.11n/ac communication capacity, or even may possess in following STA the 802.11ax of higher order communication capacity.
Whether AP or STA, its communication capacity will all be lifted therewith, the rule of particularly 802.11ax even more high-orders
Lattice, system become increasingly complex, will be more serious in terms of signal interference, accordingly, it would be desirable to there is a kind of hardware plan of collocation, solve
Certainly signal interference and increase communication quality.
The content of the invention
In view of this, in order to solve signal interference and increase communication quality, the invention provides a kind of WLAN
Communicator and its method.
To achieve the above object, one embodiment of the present invention uses following technical scheme:A kind of WLAN
Communicator, comprising:One first antenna;And a wireless transceiver, the first antenna is coupled to, to produce a non-efficient energy
Package and a high-effect package;Wherein, the non-efficient energy package includes one first Legacy white silk section (L-STF), one first
The long training section (L-LTF) of tradition, one first traditional signaling message section (L-SIG), one first data segment (DATA);The non-efficient
Energy package does not repeat the first traditional signaling message section;The high-effect package includes one second Legacy and practices section (L-STF), one
The long training section (L-LTF) of second tradition, one second traditional signaling message section (L-SIG), the second traditional signaling message area repeated
Section (RL-SIG), a high-effect signaling section (HE-SIG-A), a high-effect Short Training section (HE-STF), a high-effect long instruction
Practice section (HE-LTF), one second data segment (DATA);And the wireless transceiver includes an inductance, and the inductance is arranged at
In one chip.
It is real of the invention one for the usable floor area of chip, and the path of increase chip external connection can be being reduced
Apply in example, wireless transceiver is to use brilliant encapsulation technology.
For the electromagnetic interference between inductance and arrays of solder balls can be greatly decreased, increase the quality in inductance use, at this
In one embodiment of invention, do not covered in the vertical direction of inductance by arrays of solder balls.
For the density of arrays of solder balls can be avoided too high, interfere, in an embodiment of the present invention, arrays of solder balls is made
Area is designed at least above the chip 50%.
For that can obtain higher quality inductance, in an embodiment of the present invention, inductance is designed to 8 font inductance.
For that can solve the problems, such as that in LAN network is jammed and is capable of compatible each different communication ability
User, in one embodiment of this invention, non-efficient energy package are respectively sent to not with high-effect package by different antennae
With in frequency range simultaneously so that different frequency range is used.
It is in one embodiment of this invention, described high-effect for more data volumes can be sent in same package
Package is also directly connected in after second data segments comprising a package extension of section.
Use for the resource of frequency spectrum can be increased and reach while send the environment occasion of different modulation schemes, in this hair
In a bright embodiment, there is provided a kind of mechanism of double modulations, the non-efficient energy package is using OFDM
(OFDM) modulation scheme and the high-effect package using OFDM (OFDMA) modulation scheme.
On the other hand, to achieve the above object, another embodiment of the present invention uses following technical scheme:It is a kind of wireless
Local area network communication device, comprising:One first antenna;And
One wireless transceiver, the first antenna is coupled to, to produce an at least package;Wherein, the package includes one and passed
What system Short Training section (L-STF), the long training section (L-LTF) of a tradition, a traditional signaling message section (L-SIG), one repeated is somebody's turn to do
Traditional signaling message section (RL-SIG), a high-effect signaling section (HE-SIG-A), a high-effect Short Training section (HE-STF), one
High-effect long training section (HE-LTF) and a data segments (DATA);And wherein, the wireless transceiver includes an inductance,
And the inductance is arranged in a chip;One first side of the chip includes a plurality of soldered balls (Solder Ball) array, the chip
One second side be a substrate (Substrate).
Other advantages of the present invention and it is to be solved the problem of will be carried out in more detail by the following description and schema
Explain.
Brief description of the drawings
Fig. 1 is the schematic diagram of WLAN communication device first embodiment of the present invention.
Fig. 2 is the schematic diagram of each section (field) in non-efficient energy package of the present invention.
Fig. 3 is the schematic diagram of each section (field) in the high-effect package of the present invention.
Fig. 4 is the profile of the embodiment of wireless transceiver one.
Fig. 5 is the top view of the embodiment of wireless transceiver one.
Fig. 6 is an embodiment schematic diagram of inductor design.
Fig. 7 is WLAN communication device second embodiment schematic diagram of the present invention.
Embodiment
Illustrate embodiments of the invention below in conjunction with correlative type.In the drawings, identical label represent it is identical or
Similar component or method flow.
Fig. 1 is the schematic diagram of the embodiment of WLAN communication device 100 1 of the present invention.WLAN communication fills
Put 100 to use as an AP in the present embodiment, it includes a first antenna 101, one second antenna 102 and a wireless receiving and dispatching
Device 103.The antenna 102 of first antenna 101 and second is used for sending package caused by wireless transceiver 103 to the first website STA1
With the second website STA2, and package transmitted by the first website STA1 and the second website STA2 is received to wireless transceiver 103.
WLAN communication device 100 in order to support the transmission of multiple websites (STA1, STA2) and must coordinate
The communication capacity of each website, wireless transceiver 103 at least possess the ability for producing at least two different type packages, below will
It is described further.
According to one embodiment of the invention, it is assumed that the first website STA1 communication capacity only reaches to 802.11a/b/g/n/ac
Ability, and the second website STA2 communication capacity then reaches 802.11ax communication capacity, then the first website STA1 will be used
Non-efficient energy package 110 is by the antenna 102 of first antenna 101 and/or second and the sending and receiving data of wireless transceiver 103, and second
Site STA 2 is then to be received using high-effect package 120 by the antenna 102 of first antenna 101 and/or second with wireless transceiver 103
Send data.
According to an embodiment, non-efficient energy package 110 and high-effect package 120 can be respectively by first antennas 101 and second
Antenna 102 is sent to different frequency range, such as;First antenna 101 sends non-efficient energy package 110 to 2.4G frequency ranges, and second
Antenna 102 sends high-effect package 120 to 5G frequency ranges, consequently, it is possible to may be such that different frequency range while used, increase is overall
Efficiency.
To enable WLAN communication device 100 smoothly to send non-efficient package 110 or high-effect package 120,
Wireless transceiver 103 is realized by a chip, and an inductance 104 is included in the wireless transceiver 103, is met with producing
The oscillator signal of telecommunications metrics.
In addition, although WLAN communication device 100 is illustrated using multiple antennas as embodiment, the present invention not with
This is limited, and WLAN communication device 100 also can send the package of non-efficient energy package 110 or high-effect using single antenna
120。
Fig. 2 is the schematic diagram of each section (field) in non-efficient energy package 110.Non-efficient energy package 110 exists
Practice section (Legacy Short Training Field, L-STF), tradition length comprising Legacy under 802.11a/g pattern
Train section (Legacy Long Training Field, L-LTF), traditional signaling message section (Legacy Signal Field,
L-SIG), data segments (DATA).Non-efficient energy package 110, compared to 802.11a/g, also includes under 802.11n pattern
High-throughput signaling section (High Throughput Signal Field, HT-SIG), high-throughput Short Training section (High
Throughput Short Training Field, HT-STF) and high-throughput length training section (High Throughput
Long Training Field, HT-LTF).Non-efficient energy package 110 is under 802.11ac pattern, compared to 802.11a/
G, also comprising extra-high handling capacity signaling A sections (Very High Throughput Signal A Field, VHT-SIG-A), spy
High-throughput Short Training section (Very High Throughput Short Training Field, VHT-STF), extra-high gulp down
The amount of telling length training section (Very High Throughput Long Training Field, VHT-LTF) and extra-high handle up
Measure signaling B sections (Very High Throughput Signal B Field, VHT-SIG-B).
Fig. 3 (A), 3 (B) are the schematic diagram of each section (field) in high-effect package 120.Fig. 3 (A) is high-effect envelope
(the High Efficiency-Single User-Presentation Protocol under the pattern of sole user of bag 120
Data Unit HE-SU-PPDU) form, include Legacy and practice section (Legacy Short Training Field, L-
STF), the long training section (Legacy Long Training Field, L-LTF) of tradition, traditional signaling message section (Legacy
Signal Field, L-SIG), repeat traditional signaling message section (Repeated Legacy Signal Field, RL-SIG),
High-effect signaling A sections (High Efficiency Signal A Field, HE-SIG-A), high-effect Short Training section
(High EfficiencyShort Training Field, HE-STF), high-effect long training section (High Efficiency
Long Training Field, HE-LTF), data segments (DATA) and package extension of section (Packet Extension,
PE)。
Fig. 3 (B) is high-effect package 120 (High Efficiency-Multi User- under the pattern of multi-user
Presentation Protocol Data Unit HE-MU-PPDU) form, include Legacy and practice section (Legacy
Short Training Field, L-STF), the long training section (Legacy Long Training Field, L-LTF) of tradition,
Traditional signaling message section (Legacy Signal Field, L-SIG), traditional signaling message section (the Repeated Legacy repeated
Signal Field, RL-SIG), high-effect signaling A sections (High Efficiency Signal A Field, HE-SIG-
A), high-effect signaling B sections (High Efficiency Signal B Field, HE-SIG-B), high-effect Short Training section
(High Efficiency Short Training Field, HE-STF), high-effect long training section (High
Efficiency Long Training Field, HE-LTF), data segments (DATA) and package extension of section (Packet
Extension, PE).
Please refer to Fig. 2 and Fig. 3 (A), 3 (B), it can clearly show that, non-efficient energy package 110 and high-effect package
120 one of difference is that traditional signaling message section (L-SIG) is repeated once and is directly connected at by high-effect package 120
Afterwards, that is, the traditional signaling message section (RL-SIG) repeated is directly connected at after traditional signaling message section (L-SIG);It is rather than high-effect
Package 110 is not repeat traditional signaling message section (L-SIG).
Non-efficient energy package 110 and high-effect package 120 another difference is that high-effect package 120 in data segments
(DATA) continue a package extension of section (PE) after;Rather than high-effect package 110 is not include package extension of section (PE).So
One, high-effect package 120 can send more data quantities in same package.
In addition, use to increase the resource of frequency spectrum and reach while send the environment occasion of different modulation schemes,
One embodiment of invention provides non-efficient energy package 110 and uses OFDM (Orthogonal frequency-
Division multiplexing, OFDM) mode send, and high-effect package 120 then uses OFDM
The mode of (Orthogonal Frequency Division Multiple Access, OFDMA) is sent.
To avoid repeating, Fig. 2 only illustrates non-efficient energy package 110 respectively with Fig. 3 (A), 3 (B) can with high-effect package 120
Several sending modes of energy, the present invention are not limited merely to sending mode shown in icon.
Fig. 4 is the profile of the embodiment of wireless transceiver 103 1.Comprising chip 400 one by one in wireless transceiver 103, and
Using brilliant encapsulation (Flip-Chip) technology.By icon, it will be clearly understood that, one first side of the chip 400 includes a plurality of welderings
Ball (Solder Ball) array 401, and one second side of the chip 400 is a substrate (Substrate) 402, wherein inductance
104 are arranged between arrays of solder balls 401 and substrate 402, i.e., in insulating barrier 403.It is using one of brilliant the advantages of encapsulating
Reduce the usable floor area of chip 400, and the path of the increase external connection of chip 400.
Fig. 5 is the top view of the embodiment of wireless transceiver 103 1.Chip 400 in wireless transceiver 103, its first side
On a plurality of arrays of solder balls 401 cover the chip one first part area A (grey parts), do not cover the chip one second
Part area B (white portion), and inductance 104 is arranged under the second part area B.A plurality of welderings designed by the present embodiment
The not substantive overlying lid whole chip 400 of ball array 401, and the vertically oriented portion of inductance 104 is avoided, the design can significantly subtract
Few electromagnetic interference between inductance 104 and arrays of solder balls 401, increase inductance 104 use upper quality.In addition, the area of inductance 104
Design it is also unsuitable excessive, avoid the density of arrays of solder balls 401 too high, i.e., first part area A is too small, and causes arrays of solder balls
Interference problem on 401 between signal.Therefore in one embodiment, first part area used in arrays of solder balls 401 be by
Design is at least above the chip 50%.Note, in arrays of solder balls 401, the interval D between soldered ball and soldered ball also belongs to first
Part area A, rather than the second part area B.
Fig. 6 is an embodiment schematic diagram of inductor design.In order to obtain higher quality inductance, one embodiment of the invention
Using 8 font inductance 600.8 font inductance present two circulations, i.e. first circulation 602 and second circulation 604, and first
Circulation 602 differs with the sense of current in second circulation 604.When the sense of current of first circulation 602 is wink clockwise,
It is then counterclockwise that the sense of current of second circulation 604, which is,.The advantages of 8 font inductance, is structural symmetry height, can reduce
Interference, is more suitable for the design of high-frequency circuit.
Fig. 7 is another embodiment schematic diagram of WLAN communication device of the present invention.WLAN of the present invention
Communicator is also can serve as STA uses, as WLAN leads in Fig. 7 in addition to being used as shown in Figure 1 as an AP
Shown in T unit 700.There may be products application quite not of the same race as the WLAN communication device 700 that STA is used,
Such as:TV, pen electricity, mobile phone, flat board, network camera, set top box ... wait different end products, Fig. 7 only with mobile phone as
One pictorial representation.
WLAN communication device 700 as shown in Figure 7, its internal at least antenna 701 and one that includes wirelessly are received
Device 703 is sent out, and the wireless transceiver 703 is coupled to the antenna 701.In the present embodiment, wireless transceiver 703 can produce non-
High-effect package 110 or high-effect package 120 are simultaneously transmitted it out by antenna 701.
To enable WLAN communication device 700 smoothly to send non-efficient package 110 or high-effect package 120,
Wireless transceiver 703 is realized by a chip, and an inductance 704 is included in the wireless transceiver 703, is met with producing
The oscillator signal of telecommunications metrics.
The chip 400 that the chip and inductor design of wireless transceiver 703 refer to Fig. 4 to Fig. 6 illustrates, does not repeat to go to live in the household of one's in-laws on getting married herein
State.In addition, WLAN communication device 700 also can be by multiple antennas by the package 120 of non-efficient energy package 110 or high-effect
Send, the invention is not limited in the application of single antenna.
In summary, the present invention provides a kind of inductor design mode for supporting high-effect package transmission, except using chip
It is further to use the spy such as brilliant encapsulation, the section layout of arrays of solder balls and/or 8 font inductance outside the solution of inductance
Different designing technique, to solve signal interference problem in following crowded network environment, increase the quality of communication.
Presently preferred embodiments of the present invention is these are only, all equivalent changes and modifications done according to claims of the present invention, all should
Belong to the covering scope of the present invention.
Claims (10)
1. a kind of WLAN communication device, it is characterised in that include:
One first antenna;And
One wireless transceiver, the first antenna is coupled to, to produce a non-efficient energy package and a high-effect package;
Wherein, the non-efficient energy package includes one first Legacy white silk section (L-STF), the long training section of one first tradition
(L-LTF), one first traditional signaling message section (L-SIG), one first data segment (DATA);The non-efficient energy package does not repeat this
First traditional signaling message section;The high-effect package includes one second Legacy and practices section (L-STF), the long training of one second tradition
It is section (L-LTF), one second traditional signaling message section (L-SIG), the second traditional signaling message section (RL-SIG) repeated, one high
Efficiency signaling section (HE-SIG-A), a high-effect Short Training section (HE-STF), a high-effect long training section (HE-LTF),
One second data segment (DATA);And the wireless transceiver includes an inductance, and the inductance is arranged in a chip.
2. WLAN communication device as claimed in claim 1, it is characterised in that one first side of the chip includes multiple
Several soldered ball (Solder Ball) arrays;And one second side of the chip is a substrate (Substrate).
3. WLAN communication device as claimed in claim 2, it is characterised in that a plurality of arrays of solder balls coverings should
The first part area of chip one;A plurality of arrays of solder balls do not cover the part area of chip one second;And the inductance is set
Under the second part area.
4. WLAN communication device as claimed in claim 3, it is characterised in that the first part area at least above
The chip 50%.
5. WLAN communication device as claimed in claim 1, it is characterised in that the inductance is one 8 font inductance.
6. a kind of WLAN communication device, it is characterised in that include:
One first antenna;And
One wireless transceiver, the first antenna is coupled to, to produce an at least package;
Wherein, the package includes Legacy white silk section (L-STF), the long training section (L-LTF) of a tradition, a traditional signaling message
It is section (L-SIG), the traditional signaling message section (RL-SIG) repeated, a high-effect signaling section (HE-SIG-A), one efficient
Can Short Training section (HE-STF), a high-effect long training section (HE-LTF) and a data segments (DATA);And
Wherein, the wireless transceiver includes an inductance, and the inductance is arranged in a chip;One first side of the chip includes multiple
Several soldered ball (Solder Ball) arrays, one second side of the chip is a substrate (Substrate).
7. WLAN communication device as claimed in claim 6, it is characterised in that the chip is by brilliant encapsulation
(Flip-Chip) realized.
8. WLAN communication device as claimed in claim 6, it is characterised in that a plurality of arrays of solder balls coverings should
The first part area of chip one;A plurality of arrays of solder balls do not cover the part area of chip one second;And the inductance is set
Under the second part area.
9. WLAN communication device as claimed in claim 8, it is characterised in that the first part area at least above
The chip 50%.
10. WLAN communication device as claimed in claim 9, it is characterised in that the inductance is one 8 font inductance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610868409.4A CN107889277A (en) | 2016-09-30 | 2016-09-30 | Wireless local area network communicator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610868409.4A CN107889277A (en) | 2016-09-30 | 2016-09-30 | Wireless local area network communicator |
Publications (1)
Publication Number | Publication Date |
---|---|
CN107889277A true CN107889277A (en) | 2018-04-06 |
Family
ID=61769727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201610868409.4A Pending CN107889277A (en) | 2016-09-30 | 2016-09-30 | Wireless local area network communicator |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN107889277A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004114460A2 (en) * | 2003-06-19 | 2004-12-29 | Ipr Licensing, Inc. | Antenna steering for an access point based upon probe signals |
CN204993415U (en) * | 2015-07-06 | 2016-01-20 | 于坤 | Intelligence dual -frenquency wireless router |
CN105432051A (en) * | 2013-04-15 | 2016-03-23 | 高通股份有限公司 | Systems and methods for backwards-compatible preamble formats for multiple access wireless communication |
-
2016
- 2016-09-30 CN CN201610868409.4A patent/CN107889277A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004114460A2 (en) * | 2003-06-19 | 2004-12-29 | Ipr Licensing, Inc. | Antenna steering for an access point based upon probe signals |
CN105432051A (en) * | 2013-04-15 | 2016-03-23 | 高通股份有限公司 | Systems and methods for backwards-compatible preamble formats for multiple access wireless communication |
CN204993415U (en) * | 2015-07-06 | 2016-01-20 | 于坤 | Intelligence dual -frenquency wireless router |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20230361976A1 (en) | Signaling method for multi-user transmission, and wireless communication terminal and wireless communication method using same | |
US11765768B2 (en) | Wireless communication method using OFDMA random access and wireless communication terminal using same | |
US11653418B2 (en) | Multi-link discovery signaling in extremely high throughput (EHT) systems | |
CN109906639A (en) | The method that effective power for wake on wireless electricity is saved | |
US20220109600A1 (en) | Coexistence of ofdm and on-off keying (ook) signals in wlan | |
US11838793B2 (en) | Wireless communication method and wireless communication terminal for transmitting information on buffer status | |
CN107947850A (en) | The HEW main websites and method to communicate for the OFDMA technologies according to scheduled on secondary channels | |
TWI796702B (en) | Wireless communication method and apparatus | |
CN109600845A (en) | A kind of resource regulating method, the network equipment and communication equipment | |
US9380492B2 (en) | Methods, systems and apparatuses to enable short frames | |
CN108886712A (en) | Support the wireless communications method of multi-user's cascaded transmission and the wireless communication terminal using this method | |
US20230100162A1 (en) | Power efficient broadcasting in wlan | |
JP6478249B2 (en) | Data transmission method and communication device | |
CN113613330A (en) | Apparatus and method for acquiring and reporting resource requirements of shared access points for multi-access point cooperation | |
CN107889277A (en) | Wireless local area network communicator | |
US11722277B2 (en) | Wireless communication method and wireless communication terminal using training signal | |
TW202139640A (en) | Tone plan for wireless communication | |
CN107645745A (en) | Wireless LAN communicator | |
WO2024139664A1 (en) | Communication method and apparatus | |
WO2024102975A1 (en) | Methods for broadcasting and aiml discovery in wlan |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
WD01 | Invention patent application deemed withdrawn after publication | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180406 |