GB1394642A - Electrical alarm instruments - Google Patents
Electrical alarm instrumentsInfo
- Publication number
- GB1394642A GB1394642A GB1052773A GB1052773A GB1394642A GB 1394642 A GB1394642 A GB 1394642A GB 1052773 A GB1052773 A GB 1052773A GB 1052773 A GB1052773 A GB 1052773A GB 1394642 A GB1394642 A GB 1394642A
- Authority
- GB
- United Kingdom
- Prior art keywords
- horn
- mode
- inductance
- energized
- relay
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Emergency Alarm Devices (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US23477572A | 1972-03-15 | 1972-03-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1394642A true GB1394642A (en) | 1975-05-21 |
Family
ID=22882779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1052773A Expired GB1394642A (en) | 1972-03-15 | 1973-03-05 | Electrical alarm instruments |
Country Status (4)
Country | Link |
---|---|
US (1) | US3774186A (de) |
CA (1) | CA981754A (de) |
DE (1) | DE2312977A1 (de) |
GB (1) | GB1394642A (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3936814A (en) * | 1974-04-29 | 1976-02-03 | Bernz-O-Matic Corporation | Smoke detector and alarm |
US3879717A (en) * | 1974-06-19 | 1975-04-22 | K F Ind Inc | Portable methane monitor and alarm system |
US4001800A (en) * | 1974-06-24 | 1977-01-04 | Gentex Company | Smoke detecting device |
US3980997A (en) * | 1974-07-17 | 1976-09-14 | General Signal Corporation | Smoke detector |
US4021792A (en) * | 1975-06-23 | 1977-05-03 | Wellen Industries | Smoke alarm |
US4283657A (en) * | 1976-03-25 | 1981-08-11 | Lampiridae Associates | Exit illuminating system |
US4096473A (en) * | 1976-12-09 | 1978-06-20 | P.R. Mallory & Co. Inc. | High output smoke and heat detector alarm system utilizing a piezoelectric transducer and a voltage doubling means |
US4101880A (en) * | 1976-12-27 | 1978-07-18 | Wheelock Signals, Inc. | Audiovisual signaling device |
US4093943A (en) * | 1976-12-27 | 1978-06-06 | Knight Webster B | Sequential power distribution circuit |
US4302753A (en) * | 1978-01-26 | 1981-11-24 | Pittway Corporation | Multi-function combustion detecting device |
USRE30620E (en) * | 1978-07-03 | 1981-05-19 | P. R. Mallory & Co. Inc. | High output smoke and heat detector alarm system utilizing a piezoelectric transducer and a voltage doubling means |
US4266220A (en) * | 1979-07-27 | 1981-05-05 | Malinowski William J | Self-calibrating smoke detector and method |
US4471346A (en) * | 1981-06-02 | 1984-09-11 | Eberhard Faber, Inc. | Smoke detector |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1290819B (de) * | 1963-09-05 | 1969-03-13 | Kalle Ag | Vorrichtung zur Benetzungsentwicklung von elektrophotographischem Aufzeichnungsmaterial |
US3487404A (en) * | 1967-03-23 | 1969-12-30 | Avco Corp | Combined fire alarm,burglar alarm,and intercommunication system |
US3555532A (en) * | 1968-10-29 | 1971-01-12 | Graham Stuart Corp | Vapor or particle detection device |
US3693110A (en) * | 1971-02-23 | 1972-09-19 | C A Briggs Co | Audible signal or alarm device including two variable frequency unijunction transistor oscillators |
-
1972
- 1972-03-15 US US00234775A patent/US3774186A/en not_active Expired - Lifetime
-
1973
- 1973-03-02 CA CA165,084A patent/CA981754A/en not_active Expired
- 1973-03-05 GB GB1052773A patent/GB1394642A/en not_active Expired
- 1973-03-15 DE DE2312977A patent/DE2312977A1/de active Pending
Also Published As
Publication number | Publication date |
---|---|
US3774186A (en) | 1973-11-20 |
DE2312977A1 (de) | 1973-09-27 |
CA981754A (en) | 1976-01-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |