FR542978A - Improvements to warning devices and fire extinguishers - Google Patents

Improvements to warning devices and fire extinguishers

Info

Publication number
FR542978A
FR542978A FR542978DA FR542978A FR 542978 A FR542978 A FR 542978A FR 542978D A FR542978D A FR 542978DA FR 542978 A FR542978 A FR 542978A
Authority
FR
France
Prior art keywords
warning devices
fire extinguishers
extinguishers
fire
warning
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
Other languages
French (fr)
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.)
Kidde Inc
Original Assignee
Walter Kidde and Co 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 Walter Kidde and Co Inc filed Critical Walter Kidde and Co Inc
Application granted granted Critical
Publication of FR542978A publication Critical patent/FR542978A/en
Expired legal-status Critical Current

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
    • 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
    • G01N21/29—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
FR542978D 1921-06-28 1921-11-02 Improvements to warning devices and fire extinguishers Expired FR542978A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US480967A US1516608A (en) 1921-06-28 1921-06-28 Detection of suspended matter in gases
GB28341/21A GB191856A (en) 1921-06-28 1921-10-25 An improved system for the detection of smoke, or fine particles carried in suspension in a gas or vapour
NL20701A NL14479C (en) 1921-06-28 1921-11-01
FR542978T 1921-11-02
DEK79789D DE394973C (en) 1921-06-28 1921-11-06 Device for detecting smoke or finely divided bodies in gases or fumes

Publications (1)

Publication Number Publication Date
FR542978A true FR542978A (en) 1922-08-24

Family

ID=10274140

Family Applications (1)

Application Number Title Priority Date Filing Date
FR542978D Expired FR542978A (en) 1921-06-28 1921-11-02 Improvements to warning devices and fire extinguishers

Country Status (5)

Country Link
US (1) US1516608A (en)
DE (1) DE394973C (en)
FR (1) FR542978A (en)
GB (1) GB191856A (en)
NL (1) NL14479C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2549866A (en) * 1944-12-23 1951-04-24 Specialties Dev Corp Apparatus for visual detection of illuminated suspended matter in fluids
US2770162A (en) * 1952-06-05 1956-11-13 Specialties Dev Corp Apparatus for visually detecting suspended matter in fluid
US2731874A (en) * 1953-06-22 1956-01-24 Smoke detecting apparatus
US4385830A (en) * 1980-11-26 1983-05-31 Cornell Research Foundation, Inc. Direct measurement of vorticity by optical probe
EP0302977A1 (en) * 1987-08-14 1989-02-15 Noguchi, Tokushige Device for detecting or viewing materials floating in fluids

Also Published As

Publication number Publication date
DE394973C (en) 1924-05-13
NL14479C (en) 1926-04-15
US1516608A (en) 1924-11-25
GB191856A (en) 1923-01-25

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