GB1379535A - Smoke detectors - Google Patents
Smoke detectorsInfo
- Publication number
- GB1379535A GB1379535A GB3046473A GB3046473A GB1379535A GB 1379535 A GB1379535 A GB 1379535A GB 3046473 A GB3046473 A GB 3046473A GB 3046473 A GB3046473 A GB 3046473A GB 1379535 A GB1379535 A GB 1379535A
- Authority
- GB
- United Kingdom
- Prior art keywords
- june
- plastics material
- conductive plastics
- smoke
- smoke detectors
- 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
- G08B17/11—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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Emergency Management (AREA)
- Toxicology (AREA)
- Business, Economics & Management (AREA)
- Electrochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
1379535 lonization detectors ANGLO AMERICAN CORP OF SOUTH AFRICA Ltd 27 June 1973 [27 June 1972 15 Nov 1972] 30464/73 Heading H1D In a smoke detector of the ionization type comprising a smoke chamber 36 and a reference chamber 18 each containing a grid electrode 38, 32, the sections 20, 22 and the housing 34 are made of conductive plastics material which provides electrostatic shielding yet is resistant to corrosion. Such a material can contain carbon black as metal dopes to give a resistivity of about 10<SP>-4</SP> ohms /cc. The grid electrodes 32, 38 can also be made of conductive plastics material.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA724440A ZA724440B (en) | 1972-06-27 | 1972-06-27 | Smoke detectors |
ZA728084 | 1972-11-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1379535A true GB1379535A (en) | 1975-01-02 |
Family
ID=27131055
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3046473A Expired GB1379535A (en) | 1972-06-27 | 1973-06-27 | Smoke detectors |
Country Status (8)
Country | Link |
---|---|
US (1) | US3824422A (en) |
JP (1) | JPS4953494A (en) |
AU (1) | AU475495B2 (en) |
CA (1) | CA990865A (en) |
CH (1) | CH566060A5 (en) |
DE (1) | DE2332424C3 (en) |
FR (1) | FR2191731A5 (en) |
GB (1) | GB1379535A (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA734995B (en) * | 1973-07-23 | 1974-10-30 | Anglo Amer Corp South Africa | Improvemente in or relating to fire detectors |
JPS5552558Y2 (en) * | 1975-02-10 | 1980-12-05 | ||
JPS633253A (en) * | 1986-06-24 | 1988-01-08 | Nemoto Tokushu Kagaku Kk | Aerosol concentration measuring instrument |
JP2536630Y2 (en) * | 1989-02-20 | 1997-05-21 | 能美防災 株式会社 | Photoelectric smoke detector |
US6040523A (en) * | 1996-12-11 | 2000-03-21 | Raytheon Company | Snap-fit design of an airborne missile systems seeker/detector section using engineering plastics |
US6057774A (en) * | 1999-01-21 | 2000-05-02 | Brk Brands, Inc. | Smoke alarm with anti-dust screen |
DE102008032145B4 (en) * | 2008-07-08 | 2012-12-06 | Techem Energy Services Gmbh | Alarm device with a detection chamber open to the environment |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3769917A (en) * | 1971-12-20 | 1973-11-06 | Pullman Inc | Freight bracing apparatus |
-
1973
- 1973-06-25 US US00373317A patent/US3824422A/en not_active Expired - Lifetime
- 1973-06-26 DE DE2332424A patent/DE2332424C3/en not_active Expired
- 1973-06-26 AU AU57364/73A patent/AU475495B2/en not_active Expired
- 1973-06-26 CA CA174,945A patent/CA990865A/en not_active Expired
- 1973-06-27 JP JP48072699A patent/JPS4953494A/ja active Pending
- 1973-06-27 GB GB3046473A patent/GB1379535A/en not_active Expired
- 1973-06-27 FR FR7323496A patent/FR2191731A5/fr not_active Expired
- 1973-06-27 CH CH934873A patent/CH566060A5/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
AU5736473A (en) | 1975-01-09 |
DE2332424B2 (en) | 1977-10-27 |
DE2332424A1 (en) | 1974-01-31 |
CA990865A (en) | 1976-06-08 |
FR2191731A5 (en) | 1974-02-01 |
CH566060A5 (en) | 1975-08-29 |
JPS4953494A (en) | 1974-05-24 |
AU475495B2 (en) | 1976-08-26 |
US3824422A (en) | 1974-07-16 |
DE2332424C3 (en) | 1978-06-22 |
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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 |
Effective date: 19920627 |