FR2254840B1 - - Google Patents
Info
- Publication number
- FR2254840B1 FR2254840B1 FR7344777A FR7344777A FR2254840B1 FR 2254840 B1 FR2254840 B1 FR 2254840B1 FR 7344777 A FR7344777 A FR 7344777A FR 7344777 A FR7344777 A FR 7344777A FR 2254840 B1 FR2254840 B1 FR 2254840B1
- Authority
- FR
- France
- 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.)
- Expired
Links
Classifications
-
- 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
- G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
- G08B13/1645—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means and other detection means, e.g. microwave or infrared radiation
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
- G08B13/2494—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field by interference with electro-magnetic field distribution combined with other electrical sensor means, e.g. microwave detectors combined with other sensor means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Burglar Alarm Systems (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7344777A FR2254840A1 (en) | 1973-12-14 | 1973-12-14 | Surveillance system for building - has coincidence circuit which triggers alarm if all detectors have been actuated |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7344777A FR2254840A1 (en) | 1973-12-14 | 1973-12-14 | Surveillance system for building - has coincidence circuit which triggers alarm if all detectors have been actuated |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2254840A1 FR2254840A1 (en) | 1975-07-11 |
FR2254840B1 true FR2254840B1 (fr) | 1978-03-03 |
Family
ID=9129231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7344777A Granted FR2254840A1 (en) | 1973-12-14 | 1973-12-14 | Surveillance system for building - has coincidence circuit which triggers alarm if all detectors have been actuated |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2254840A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4792270A (en) * | 1983-03-16 | 1988-12-20 | Itoki Co., Ltd. | Automatic rental safe-depositing box system |
-
1973
- 1973-12-14 FR FR7344777A patent/FR2254840A1/fr active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2254840A1 (en) | 1975-07-11 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |