GB1395245A - Smoke detectors - Google Patents

Smoke detectors

Info

Publication number
GB1395245A
GB1395245A GB4759072A GB4759072A GB1395245A GB 1395245 A GB1395245 A GB 1395245A GB 4759072 A GB4759072 A GB 4759072A GB 4759072 A GB4759072 A GB 4759072A GB 1395245 A GB1395245 A GB 1395245A
Authority
GB
United Kingdom
Prior art keywords
voltage
photo
resistor
detector
capacitor
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
Application number
GB4759072A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pyrotector Inc
Original Assignee
Pyrotector Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pyrotector Inc filed Critical Pyrotector Inc
Publication of GB1395245A publication Critical patent/GB1395245A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
GB4759072A 1971-12-13 1972-10-16 Smoke detectors Expired GB1395245A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20746171A 1971-12-13 1971-12-13

Publications (1)

Publication Number Publication Date
GB1395245A true GB1395245A (en) 1975-05-21

Family

ID=22770642

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4759072A Expired GB1395245A (en) 1971-12-13 1972-10-16 Smoke detectors

Country Status (7)

Country Link
US (1) US3789383A (https=)
JP (1) JPS4866794A (https=)
AU (1) AU462064B2 (https=)
DE (1) DE2251046B2 (https=)
FR (1) FR2165480A5 (https=)
GB (1) GB1395245A (https=)
SE (1) SE385057B (https=)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987358A (en) * 1972-01-26 1976-10-19 The Walter Kidde & Company, Inc. Condition detector circuit
US3898553A (en) * 1974-04-26 1975-08-05 Rca Corp Circuit for supplying power to a load
US4206456A (en) * 1975-06-23 1980-06-03 Chloride Incorporated Smoke detector
DE2965448D1 (en) * 1978-09-29 1983-07-07 Chubb Fire Security Ltd Heat detector circuit
WO1989007814A1 (en) * 1988-02-16 1989-08-24 Myers Holdings Pty Ltd; Security system for an environment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2069160A (en) * 1933-09-01 1937-01-26 Kidde & Co Walter Regulated voltage system for detecting suspended matter in fluids
US2415179A (en) * 1944-09-23 1947-02-04 Jr Samuel C Hurley Photoelectric inspection device
US3314058A (en) * 1964-01-13 1967-04-11 Aseco Inc Electronic smoke detector and fire alarm
US3403315A (en) * 1965-10-22 1968-09-24 Smith Corp A O Condition responsive control circuit connected to gate a triggered switch
US3467817A (en) * 1967-02-23 1969-09-16 West Bend Co Temperature control circuit

Also Published As

Publication number Publication date
SE385057B (sv) 1976-05-31
US3789383A (en) 1974-01-29
FR2165480A5 (https=) 1973-08-03
JPS4866794A (https=) 1973-09-12
AU462064B2 (en) 1975-06-12
AU4786672A (en) 1974-04-26
DE2251046B2 (de) 1975-08-14
DE2251046A1 (de) 1973-06-20

Similar Documents

Publication Publication Date Title
GB1500371A (en) Alarm detector
GB1135287A (en) Improvements relating to minimum voltage warning apparatus
GB1395245A (en) Smoke detectors
ES2078912T3 (es) Circuito para un sensor electromagnetico de rotacion.
GB1183230A (en) Improvements in or relating to Control Circuits for Alarm Devices
GB1285206A (en) Improvements in or relating to the electronic ignition of gas discharge tubes
GB1506539A (en) Discharge lamp
GB1208489A (en) Circuit arrangement for igniting and supplying a gas and/or vapour-discharge lamp
GB1333325A (en) Vehicle tail-lamp systems for use in fog
GB1307244A (en) Arrangement provided with a discharge flash tube
GB1159580A (en) Light Meter for High Powered Repetitive Light Flashes
GB1185579A (en) Improvements in or relating to Electronic Flash Apparatus for Photographic Purposes
GB1248283A (en) Inspection apparatus
GB994425A (en) Improvements in or relating to current regulating circuits
GB1164065A (en) Synchronous Symmetrical Switching Circuit
GB1292373A (en) Electronic flash circuit
ES338190A1 (es) Dispositivo protector termico de sobrecarga para conexionesde tiristores.
GB1184832A (en) Improvements relating to Battery Charging Apparatus
JPS5447639A (en) Flash light emission controller
GB988216A (en) Improvements in or relating to photographic and cinematographic cameras
GB1041638A (en) Illuminated display means
GB1179531A (en) Particle Detecting Devices
GB1130640A (en) Improvements in universal lamp control circuits
GB1299556A (en) Photographic exposure time control circuit
FR1520509A (fr) Dispositif de réglage automatique de la lumination et ses applications

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PLNP Patent lapsed through nonpayment of renewal fees