Expired Canadian patentCanada
Porous layer for composite sound proofing unit, and related manufacuring process
CA 1162729 A · Owner: Societe Nationale Industrielle Aerospatiale · Inventors: Briens, Guy
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 February 28, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 28, 2001.
- 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 10, 1981
GrantedFebruary 28, 1984
Term endedFebruary 28, 2001
Patent numberCA 1162729 A
Classification (IPC)E04B1/86 +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.