GB2138570B - Smoke detector - Google Patents

Smoke detector

Info

Publication number
GB2138570B
GB2138570B GB08409264A GB8409264A GB2138570B GB 2138570 B GB2138570 B GB 2138570B GB 08409264 A GB08409264 A GB 08409264A GB 8409264 A GB8409264 A GB 8409264A GB 2138570 B GB2138570 B GB 2138570B
Authority
GB
United Kingdom
Prior art keywords
smoke detector
smoke
detector
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
GB08409264A
Other versions
GB2138570A (en
GB8409264D0 (en
Inventor
Roger Barrett
Eric Macdonald
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.)
EMI Ltd
Original Assignee
EMI Ltd
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
Priority claimed from GB838310540A external-priority patent/GB8310540D0/en
Application filed by EMI Ltd filed Critical EMI Ltd
Priority to GB08409264A priority Critical patent/GB2138570B/en
Publication of GB8409264D0 publication Critical patent/GB8409264D0/en
Publication of GB2138570A publication Critical patent/GB2138570A/en
Application granted granted Critical
Publication of GB2138570B publication Critical patent/GB2138570B/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
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
    • G01N27/66—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber and measuring current or voltage
    • 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
    • G08B17/11—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
GB08409264A 1983-04-19 1984-04-10 Smoke detector Expired GB2138570B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08409264A GB2138570B (en) 1983-04-19 1984-04-10 Smoke detector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838310540A GB8310540D0 (en) 1983-04-19 1983-04-19 Smoke detector
GB08409264A GB2138570B (en) 1983-04-19 1984-04-10 Smoke detector

Publications (3)

Publication Number Publication Date
GB8409264D0 GB8409264D0 (en) 1984-05-23
GB2138570A GB2138570A (en) 1984-10-24
GB2138570B true GB2138570B (en) 1987-10-28

Family

ID=26285862

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08409264A Expired GB2138570B (en) 1983-04-19 1984-04-10 Smoke detector

Country Status (1)

Country Link
GB (1) GB2138570B (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1009271A (en) * 1963-03-04 1965-11-10 Associated Fire Alarms Ltd Improvements in or relating to smoke detector circuits
JPS446089Y1 (en) * 1966-03-30 1969-03-05
CH468682A (en) * 1967-06-26 1969-02-15 Cerberus Ag Fire alarm system
GB1216961A (en) * 1968-02-05 1970-12-23 James Holden Burnett Improved method and apparatus for detecting aerosols
CA969679A (en) * 1970-02-02 1975-06-17 George E. Frohwein Rate-of-change combustion and contamination detection apparatus
GB1381475A (en) * 1970-10-16 1975-01-22 Graviner Colnbrook Ltd Apparatus for detecting smoke and like suspensions
JPS51100085U (en) * 1975-02-10 1976-08-11
US4083037A (en) * 1975-12-08 1978-04-04 Patent Development & Management Company Detection circuit

Also Published As

Publication number Publication date
GB2138570A (en) 1984-10-24
GB8409264D0 (en) 1984-05-23

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940410