EP0037248A2 - Method and device for recycling developing material - Google Patents
Method and device for recycling developing material Download PDFInfo
- Publication number
- EP0037248A2 EP0037248A2 EP81301289A EP81301289A EP0037248A2 EP 0037248 A2 EP0037248 A2 EP 0037248A2 EP 81301289 A EP81301289 A EP 81301289A EP 81301289 A EP81301289 A EP 81301289A EP 0037248 A2 EP0037248 A2 EP 0037248A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- photosensitive material
- blade member
- developing
- drum
- latent image
- 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.)
- Withdrawn
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Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/10—Collecting or recycling waste developer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
- G03G21/0011—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using a blade; Details of cleaning blades, e.g. blade shape, layer forming
- G03G21/0029—Details relating to the blade support
Definitions
- the present invention relates to a method and a device for recycling a residual developing material on a photosensitive material after transfer step in an electrostatic copyina apparatus.
- the residual toner residing on the photosensitive material after transfer step is removed by a blade member, a fur brush, or a magnetic brush cleaning device and stored in a container. Accordingly, the magnetic toner stored in the container is either thrown away by putting out the container from the frame of the copying apparatus or is returned back to the developi n q device through a circulation pipe.
- the former prior art requires bothersome work to throw away the magnetic toner, while the latter prior art requires a intricate construction.
- a method for recycling a residual developing material on a photosensitive material after transfer step of copying operation in an electrostatic copying apparatus comprising the steps of ; (a) providing a blade member capable of sliding to contact with and separating from the photosensitive material upstream with respect to a corona charger for charging the photosensitive material before an exposure step along the travelling direction of the photosensitive material, (b) driving the blade member to slide to contact with the photosensitive material during the time when a latent image is formed onto the photosensitive material in an exposure step, and to separate from the photosensitive material during the time when the latent image is not formed in the other steps of the copying operation, thereby the photosensitive material moves to allow the developing material accumulated on the photosensitive material by means of the blade member to reach and to be stored in a developing device when a latent image is not formed.
- a device for recycling a residual developing material on a photosensitive material after transfer step of copying operation in an electrostatic copying apparatus comprising ; (c) a blade member capable of sliding to contact with and to separate from the photosensitive material upstream with respect to a corona charger for charginc the photosensitive material before an exposure step along the rotational direction of the photosensitive material, (d) means for driving the blade member to slide to contact with the photosensitive material during the time when a latent image is formed onto the photosensitive material in an exposure step, and to separate from the photosensitive material during the time when the latent image is not formed in the other steps of the copying operation, thereby the photosensitive material moves to allow the developing material accumulated on the photosensitive material by means of the blade member to reach and to be stored in a developing device when a latent image is not formed.
- the photosensitive material is coated on a surface of a drum which is driven to rotate, the blade member is situated almost right above the drum.
- the blade member also may be situated at a position where the developing material accumulated by means of the blade member does not drop from the photosensitive material downstream along the rotational direction of the drum with respect to a position right above the drum.
- a blade member is situated to slide to contact with the photosensitive material during the time when the latent imaqe is formed, and to separate from the surface of the photosensitive material when the latent image is not formed so that the blade member allow the accumulated developing material to be transported to and stored in the developing device, maintenance is exerted easily without employing complicated construction.
- FIG. 1 there is shown a simplified sectional view of the device according to the invention.
- a photosensitive material 2 is coated on the whole surface of a drum 1 driven to rotate in a copying operation, or on at least a part of the surface of the drum 1 along the rotational direction.
- the drum 1 is driven to rotate along the direction indicated by the arrow 3.
- a corona charger 4 for charging the photosensitive material 2, an exposure device 5, a magnetic brush developing device 6, a corona charger 7 for transferring operation and a cleaning device 8 in this order along the rotational direction 3.
- the photosensitive material 2 cleaned by the cleaning device 8 is charged by the corona charger 4.
- the exposure device 5 forms an electrostatic latent image corresponding to the original document on the surface of the photosensitive material 2.
- the magnetic brush developing device 6 supplies magnetic toner of the surface of the magnetic brush 9 to the photosensitive material 2 so as to form the latent image into a visible image.
- the visible toner image is transferred onto a copying paper 10 concurrently transported in accordance with the rotation of the drum 2 in the rotational direction 3, by charging of the corona charger 7 for transferrina.
- the copying paper 10 is tranported to a fixing device (not shown). Further, the magnetic toner residing on the photosensitive material 2 after transfer step is removed by the cleaning device 8.
- the cleaning device 8 when the exposure device 5 does not radiate to form a latent image onto the photosensitive material 2, the cleaning device 8 does not achieve cleaning function and the residual magnetic toner on the photosensitive material 2 is transported to the magnetic brush developing device 6 so as to be adhered to the magnetic brush 9 and to return to the supplying container 11.
- Fig. 2 is a simplified side view of the cleaning device 8, and Fig. 3 is a sectional view taken along the line III- III of Fig. 2.
- the cleaning device 8 comprises (a) a blade member 12 which slides to contact with the surface of the photosensitive material 2 right above the drum l,or upstream with respect to the corona charger 4 for charging the photosensitive material 2 along the rotational direction 3 of the drum 1, (b) a rotary shaft 14 which is mounted rotatively on a pair of side plates 13a and 13b for supporting the drum 1 rotatively, and is parallel to the drum 1, (c) a securing member 15 for securing the blade member 12 to the rotary shaft 14, (d) an arm 16 havinq one end fixed to an end of the rotary shaft 14 outside of the side plate 13a, (e) driving means 17 connected with the other end of the arm 16, and (f) a spring 18 having one end connected with the rest position of the frame of the copyinc apparatus and the other end connected with the securing member 15, and forcing
- the blde member 12 made of soft or elastic material, such as urethane, to avoid scratching or other damage to photosensitive material 2 extends almost whole length of the drum 1.
- the blade member 12 is installed slantingly to separate from the photosensetive material 2 as it comes downstream along the rotational direction 3 of the drum 1, to allow the one end 12a of the blade member 12 to slide to contact with the photosensitive material 2.
- the other end 12b of the blade member 12 is supported by the rotary shaft 14.
- the driving means 17 comprises an electromagnetic coil 19, a plunger 20 which is capable of moving along the axis of the electromagnetic coil 19, and a spring 21 forcing the plunger 20 to be spring-biased in the direction of separating from the electromagnetic coil 19.
- the other end of the arm 16 is pin-connected with the plunger 20.
- the driving means 17 has a function to draw the plunqer 20 into the electromaqnetic coil 19 against the force of springs 18 and 21 in an excited state of the electromagnetic coil 19, and to release the plunger 20 from the electromagnetic coil 19 by the springs 18 and 21 in a non-excited state. Accordingly, in the excited state of the electromagnetic coil.19, the rotary shaft l4 rotates in the direction indicated by the arrow 22 (referred in Fig. 2), and thus the blade member 12 comes to slide to contact with the photosensitive material 2 against the force of the sprinq 18.
- the rotary shaft 14 rotates in the direction opposite to the arrow 22, and thus the blade member 12 comes to separate from the photosensitve material 2 as indicated in the imaginary line in Fig. 2.
- the electromagnetic coil 19 is regulated to be enerqized in response to a signal qenerated accordingly to a movable original document carrier or a movable portion of the exposure device. Except during the time when a latent imaqe is formed, the blade member 12 is separated from the photosensitive material 2.
- the residual magnetic toner on the photosensitive material 2 after transfer step reaches the cleaning device 8 according to the rotation of the drum 1, and is accumulated by means of the blade member 12.
- the accumulated magnetic toner does not separate and drop from the photosensitive material 2, because the cleaning device 8 is situated almost right above the drum 1.
- the blade member 12 separates from the photosensitive material 2 as mentioned above, therefore the magnetic toner accumulated by means of the blade member 12 is transported to the magnetic brush developing device 6 according to the rotation of the drum 1. Then, the magnetic toner is adhered to the magnetic brush 9 and is brought into the supplying container 11.
- Time when the blade member 12 is separated from the photosensitive material 2 is chosen to be during the time when the latent image is not formed, both in a single copyinq operation and a multiple copying operation.
- the photosensitive material 2 may be coated on an endless belt alternative to the drum 1.
- the copying apparatus set forth hereinbefore achieves a copying operation during a single rotation of the drum
- the invention may be carried out in the copying apparatus wherein a copying operation is completed during two rotations of the drum 1.
- the blade member 12 may be situated downstream along the rotational direction 3 of the drum 1 with respect to the position right above the drum 1, it is important according to the invention that the blade member 12 is situated at the position where the developing material accumulated by means of the blade member 12 does not drop from the drum 1.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Sustainable Development (AREA)
- Cleaning In Electrography (AREA)
Abstract
Description
- The present invention relates to a method and a device for recycling a residual developing material on a photosensitive material after transfer step in an electrostatic copyina apparatus.
- In a conventional eletrostatic copying apparatus using magnetic toner as a developing material, the residual toner residing on the photosensitive material after transfer step is removed by a blade member, a fur brush, or a magnetic brush cleaning device and stored in a container. Accordingly, the magnetic toner stored in the container is either thrown away by putting out the container from the frame of the copying apparatus or is returned back to the developinq device through a circulation pipe. The former prior art requires bothersome work to throw away the magnetic toner, while the latter prior art requires a intricate construction.
- In another prior art where one copying operation is completed with two rotations of the photosensitive drum, a series of steps of charging, exposure, development, transfer are carried out during the first rotation, then the cleaning step is carried out by the developing device during the second rotation. According to this prior art, it is difficult that the developing device accomplishes both developing and cleaning operation completely, therefore, in practice, it has a defect that the developing and cleaning qualities are inferior.
- It is an object of the invention to provide an improved method and an improved device for recycling the accumulated residual developing material to the developing device readily.
- This object will be clear according to the description stated hereinbelow.
- To accomplish the foregoing objectives, there is provided a method for recycling a residual developing material on a photosensitive material after transfer step of copying operation in an electrostatic copying apparatus comprising the steps of ; (a) providing a blade member capable of sliding to contact with and separating from the photosensitive material upstream with respect to a corona charger for charging the photosensitive material before an exposure step along the travelling direction of the photosensitive material, (b) driving the blade member to slide to contact with the photosensitive material during the time when a latent image is formed onto the photosensitive material in an exposure step, and to separate from the photosensitive material during the time when the latent image is not formed in the other steps of the copying operation, thereby the photosensitive material moves to allow the developing material accumulated on the photosensitive material by means of the blade member to reach and to be stored in a developing device when a latent image is not formed.
- There is also provided a device for recycling a residual developing material on a photosensitive material after transfer step of copying operation in an electrostatic copying apparatus comprising ; (c) a blade member capable of sliding to contact with and to separate from the photosensitive material upstream with respect to a corona charger for charginc the photosensitive material before an exposure step along the rotational direction of the photosensitive material, (d) means for driving the blade member to slide to contact with the photosensitive material during the time when a latent image is formed onto the photosensitive material in an exposure step, and to separate from the photosensitive material during the time when the latent image is not formed in the other steps of the copying operation, thereby the photosensitive material moves to allow the developing material accumulated on the photosensitive material by means of the blade member to reach and to be stored in a developing device when a latent image is not formed.
- According to the preferred embodiments of the invention, the photosensitive material is coated on a surface of a drum which is driven to rotate, the blade member is situated almost right above the drum. The blade member also may be situated at a position where the developing material accumulated by means of the blade member does not drop from the photosensitive material downstream along the rotational direction of the drum with respect to a position right above the drum.
- Since a blade member is situated to slide to contact with the photosensitive material during the time when the latent imaqe is formed, and to separate from the surface of the photosensitive material when the latent image is not formed so that the blade member allow the accumulated developing material to be transported to and stored in the developing device, maintenance is exerted easily without employing complicated construction.
- A detailed description of the invention will be made with reference to the accompanying drawings, which are to scale. Like numerals designate corresponding parts in the several figures.
- Fig. 1 is a simplified sectional view showing the device according to the invention,
- Fig. 2 is a simplified side view of the
cleaning device 8, and - Fig. 3 is a sectional view taken along the line III-III of Fig. 2.
- The following detailed description is of the best presently contemplated mode of carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the invention since the scope of the invention best is defined by appendedsclaims.
- The following detailed description is in reference to the Figures provided for an example of the invention. Referring to Fig. 1, there is shown a simplified sectional view of the device according to the invention. A
photosensitive material 2 is coated on the whole surface of adrum 1 driven to rotate in a copying operation, or on at least a part of the surface of thedrum 1 along the rotational direction. Thedrum 1 is driven to rotate along the direction indicated by thearrow 3. Around the neighboring location of the surface of thedrum 1, there is located acorona charger 4 for charging thephotosensitive material 2, anexposure device 5, a magneticbrush developing device 6, a corona charger 7 for transferring operation and acleaning device 8 in this order along therotational direction 3. - In the copying operation, the
photosensitive material 2 cleaned by thecleaning device 8 is charged by thecorona charger 4. Theexposure device 5 forms an electrostatic latent image corresponding to the original document on the surface of thephotosensitive material 2. The magneticbrush developing device 6 supplies magnetic toner of the surface of themagnetic brush 9 to thephotosensitive material 2 so as to form the latent image into a visible image. The visible toner image is transferred onto a copyingpaper 10 concurrently transported in accordance with the rotation of thedrum 2 in therotational direction 3, by charging of the corona charger 7 for transferrina. After transfer step, the copyingpaper 10 is tranported to a fixing device (not shown). Further, the magnetic toner residing on thephotosensitive material 2 after transfer step is removed by thecleaning device 8. - Acceding to one aspect of the invention, when the
exposure device 5 does not radiate to form a latent image onto thephotosensitive material 2, thecleaning device 8 does not achieve cleaning function and the residual magnetic toner on thephotosensitive material 2 is transported to the magneticbrush developing device 6 so as to be adhered to themagnetic brush 9 and to return to the supplyingcontainer 11.' - Fig. 2 is a simplified side view of the
cleaning device 8, and Fig. 3 is a sectional view taken along the line III- III of Fig. 2. Thecleaning device 8 comprises (a) ablade member 12 which slides to contact with the surface of thephotosensitive material 2 right above the drum l,or upstream with respect to thecorona charger 4 for charging thephotosensitive material 2 along therotational direction 3 of thedrum 1, (b) arotary shaft 14 which is mounted rotatively on a pair ofside plates drum 1 rotatively, and is parallel to thedrum 1, (c) a securingmember 15 for securing theblade member 12 to therotary shaft 14, (d) anarm 16 havinq one end fixed to an end of therotary shaft 14 outside of theside plate 13a, (e) driving means 17 connected with the other end of thearm 16, and (f) aspring 18 having one end connected with the rest position of the frame of the copyinc apparatus and the other end connected with thesecuring member 15, and forcing theblade member 12 to be spring-biased in the direction of separating theblade member 12 from thephotosensitive material 2. - The
blde member 12 made of soft or elastic material, such as urethane, to avoid scratching or other damage tophotosensitive material 2 extends almost whole length of thedrum 1. Theblade member 12 is installed slantingly to separate from thephotosensetive material 2 as it comes downstream along therotational direction 3 of thedrum 1, to allow the oneend 12a of theblade member 12 to slide to contact with thephotosensitive material 2. Theother end 12b of theblade member 12 is supported by therotary shaft 14. The driving means 17 comprises anelectromagnetic coil 19, aplunger 20 which is capable of moving along the axis of theelectromagnetic coil 19, and aspring 21 forcing theplunger 20 to be spring-biased in the direction of separating from theelectromagnetic coil 19. The other end of thearm 16 is pin-connected with theplunger 20. - The driving means 17 has a function to draw the
plunqer 20 into theelectromaqnetic coil 19 against the force ofsprings electromagnetic coil 19, and to release theplunger 20 from theelectromagnetic coil 19 by thesprings blade member 12 comes to slide to contact with thephotosensitive material 2 against the force of thesprinq 18. In a non-excited state of theelectromagnetic coil 19, therotary shaft 14 rotates in the direction opposite to thearrow 22, and thus theblade member 12 comes to separate from thephotosensitve material 2 as indicated in the imaginary line in Fig. 2. Theelectromagnetic coil 19 is regulated to be enerqized in response to a signal qenerated accordingly to a movable original document carrier or a movable portion of the exposure device. Except during the time when a latent imaqe is formed, theblade member 12 is separated from thephotosensitive material 2. - Therefore, during the time when a latent image is formed, the residual magnetic toner on the
photosensitive material 2 after transfer step, reaches thecleaning device 8 according to the rotation of thedrum 1, and is accumulated by means of theblade member 12. The accumulated magnetic toner does not separate and drop from thephotosensitive material 2, because thecleaning device 8 is situated almost right above thedrum 1. - During the time when the
corona charger 4 and theexposure device 5 are unabled and thus the latent image is not formed, theblade member 12 separates from thephotosensitive material 2 as mentioned above, therefore the magnetic toner accumulated by means of theblade member 12 is transported to the magneticbrush developing device 6 according to the rotation of thedrum 1. Then, the magnetic toner is adhered to themagnetic brush 9 and is brought into the supplyingcontainer 11. - Time when the
blade member 12 is separated from thephotosensitive material 2 is chosen to be during the time when the latent image is not formed, both in a single copyinq operation and a multiple copying operation. - According to another aspect of the invention, the
photosensitive material 2 may be coated on an endless belt alternative to thedrum 1. Though the copying apparatus set forth hereinbefore achieves a copying operation during a single rotation of the drum, the invention may be carried out in the copying apparatus wherein a copying operation is completed during two rotations of thedrum 1. Also, theblade member 12 may be situated downstream along therotational direction 3 of thedrum 1 with respect to the position right above thedrum 1, it is important according to the invention that theblade member 12 is situated at the position where the developing material accumulated by means of theblade member 12 does not drop from thedrum 1.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP43028/80 | 1980-03-31 | ||
JP4302880A JPS56138773A (en) | 1980-03-31 | 1980-03-31 | Recovering method for developer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0037248A2 true EP0037248A2 (en) | 1981-10-07 |
EP0037248A3 EP0037248A3 (en) | 1982-02-03 |
Family
ID=12652489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81301289A Withdrawn EP0037248A3 (en) | 1980-03-31 | 1981-03-25 | Method and device for recycling developing material |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0037248A3 (en) |
JP (1) | JPS56138773A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0193274A1 (en) * | 1985-01-31 | 1986-09-03 | Konica Corporation | Image forming apparatus |
US5073800A (en) * | 1989-05-11 | 1991-12-17 | Tokyo Electric Co., Ltd. | Electrophotographic apparatus with manual and programmable blade cleaner |
US5678143A (en) * | 1993-10-15 | 1997-10-14 | Fujitsu Limited | Image forming apparatus for collecting residual toner from a drum using an AC voltage |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60130784A (en) * | 1983-12-19 | 1985-07-12 | Matsushita Electric Ind Co Ltd | Toner recovery device |
JPS6217759A (en) * | 1985-07-16 | 1987-01-26 | Konishiroku Photo Ind Co Ltd | Electronic photographing device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4154522A (en) * | 1976-08-20 | 1979-05-15 | Ricoh Company, Ltd. | Electrostatographic apparatus comprising improved drum cleaning means |
-
1980
- 1980-03-31 JP JP4302880A patent/JPS56138773A/en active Pending
-
1981
- 1981-03-25 EP EP81301289A patent/EP0037248A3/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4154522A (en) * | 1976-08-20 | 1979-05-15 | Ricoh Company, Ltd. | Electrostatographic apparatus comprising improved drum cleaning means |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0193274A1 (en) * | 1985-01-31 | 1986-09-03 | Konica Corporation | Image forming apparatus |
US5061966A (en) * | 1985-01-31 | 1991-10-29 | Konica Corporation | Method of cleaning an image retainer |
US5073800A (en) * | 1989-05-11 | 1991-12-17 | Tokyo Electric Co., Ltd. | Electrophotographic apparatus with manual and programmable blade cleaner |
AU623251B2 (en) * | 1989-05-11 | 1992-05-07 | Tokyo Electric Co. Ltd. | Electrophotographic apparatus |
USRE34840E (en) * | 1989-05-11 | 1995-01-31 | Tokyo Electric Co., Ltd. | Electrophotographic apparatus with manual and programmable blade cleaner |
US5678143A (en) * | 1993-10-15 | 1997-10-14 | Fujitsu Limited | Image forming apparatus for collecting residual toner from a drum using an AC voltage |
Also Published As
Publication number | Publication date |
---|---|
JPS56138773A (en) | 1981-10-29 |
EP0037248A3 (en) | 1982-02-03 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 19810518 |
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AK | Designated contracting states |
Designated state(s): DE FR GB IT NL |
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PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
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AK | Designated contracting states |
Designated state(s): DE FR GB IT NL |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19821111 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: NAKAJIMA, TADANOBU Inventor name: ISEKI, MASAHIDE Inventor name: KAJITA, HIROSHI |