GB9200113D0 - Intruder alarms - Google Patents
Intruder alarmsInfo
- Publication number
- GB9200113D0 GB9200113D0 GB929200113A GB9200113A GB9200113D0 GB 9200113 D0 GB9200113 D0 GB 9200113D0 GB 929200113 A GB929200113 A GB 929200113A GB 9200113 A GB9200113 A GB 9200113A GB 9200113 D0 GB9200113 D0 GB 9200113D0
- Authority
- GB
- United Kingdom
- Prior art keywords
- intruder alarms
- intruder
- alarms
- 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- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/20—Actuation by change of fluid pressure
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
- G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Burglar Alarm Systems (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9200113A GB2263771A (en) | 1992-01-04 | 1992-01-04 | Intruder alarms |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9200113A GB2263771A (en) | 1992-01-04 | 1992-01-04 | Intruder alarms |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9200113D0 true GB9200113D0 (en) | 1992-02-26 |
GB2263771A GB2263771A (en) | 1993-08-04 |
Family
ID=10708114
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9200113A Withdrawn GB2263771A (en) | 1992-01-04 | 1992-01-04 | Intruder alarms |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2263771A (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4928085A (en) * | 1983-02-23 | 1990-05-22 | Bluegrass Electronics, Inc. | Pressure change intrusion detector |
FR2622719A1 (en) * | 1987-10-30 | 1989-05-05 | Philippe Francois | DIFFERENTIAL DETECTOR OF ACOUSTIC PRESSURE |
US4991145A (en) * | 1988-08-03 | 1991-02-05 | Rabbit Systems, Inc. | Infra-sonic detector and alarm with self adjusting reference |
US4920332A (en) * | 1988-10-31 | 1990-04-24 | Francois Philippe | Differential detector of acoustic pressure |
GB2231660A (en) * | 1989-03-02 | 1990-11-21 | David Mainprize | Detecting entry into an enclosed space from air pressure changes |
-
1992
- 1992-01-04 GB GB9200113A patent/GB2263771A/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
GB2263771A (en) | 1993-08-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |