FR678433A - Perfectionnements aux détecteurs de fumée - Google Patents

Perfectionnements aux détecteurs de fumée

Info

Publication number
FR678433A
FR678433A FR678433DA FR678433A FR 678433 A FR678433 A FR 678433A FR 678433D A FR678433D A FR 678433DA FR 678433 A FR678433 A FR 678433A
Authority
FR
France
Prior art keywords
smoke detectors
detectors
smoke
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
English (en)
Inventor
George Matthew Marr
Arthur Phelps Marr
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 filed Critical
Application granted granted Critical
Publication of FR678433A publication Critical patent/FR678433A/fr
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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
FR678433D 1929-07-12 1929-07-13 Perfectionnements aux détecteurs de fumée Expired FR678433A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2154729A GB315423A (en) 1929-07-12 1929-07-12 Improvements in smoke detectors

Publications (1)

Publication Number Publication Date
FR678433A true FR678433A (fr) 1930-03-24

Family

ID=10164712

Family Applications (1)

Application Number Title Priority Date Filing Date
FR678433D Expired FR678433A (fr) 1929-07-12 1929-07-13 Perfectionnements aux détecteurs de fumée

Country Status (2)

Country Link
FR (1) FR678433A (fr)
GB (1) GB315423A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243475B (en) * 1990-04-26 1993-12-01 David Theodore Nels Williamson Improvements to gas and smoke alarm systems

Also Published As

Publication number Publication date
GB315423A (en) 1930-11-12

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