Expired Canadian patentCanada
Method for controlling the flow rate of a gas in a valve, and flow generatingdevice for use in said method
CA 1279121 C · Owner: L'Air Liquide, Societe Anonyme Pour L'Etude Et L'Exploitation Des Proced Es Georges Claude · Inventors: Lampin, Dominique; Bourdon, Guy; Leclerc, Daniel
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 January 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 18, 1987
GrantedJanuary 15, 1991
Term endedJanuary 15, 2008
Patent numberCA 1279121 C
Classification (IPC)G05D7/06
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.