Expired Canadian patentCanada
Gas mask sizing gauge
CA 898505 A · Owner: Her Majesty The Queen, In Right Of Canada, As Represented By The Minister Of National Defence · Inventors: Mann, Peter G.; Mitchell, Raymond H.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead the whole patent
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 April 25, 1972. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 1989.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 14, 1969
GrantedApril 25, 1972
Term endedApril 25, 1989
Patent numberCA 898505 A
Classification (IPC)G01B9/08 +2 more
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.