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Expired Canadian patentCanada

Means for measuring the water content of a gas

CA 1089931 A · Owner: The Secretary Of State For Defence In Her Britannic Majesty'S Government Of The United Kingdom Of Great Britain And Northern Ireland · Inventors: Fermor, James H.

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

An apparatus for measuring the amount of water in the atmosphere includes a capacitor comprising a plurality of electrical conductors each separated by a gap adapted to be accessible in use to the atmosphere to be measured and a layer of solid insulating material the material faces contiguous with the gap having a non-zero angle of contact with water.

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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Granted November 18, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 18, 1997.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 13, 1977
GrantedNovember 18, 1980
Term endedNovember 18, 1997
Patent numberCA 1089931 A
Classification (IPC)G01N27/06 +1 more

Timeline

Timeline From CIPO dates

1978198019821984198619881990199219941996Application filedApril 13, 1977Patent grantedNov 18, 1980Term endedNov 18, 1997

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.