Expired Canadian patentCanada
Covered asbestos-cement products and a process for their preparation
CA 957930 A · Owner: Cassella Farbwerke Mainkur Aktiengesellschaft · Inventors: Tichy, Dieter; Schnee, Karl; Engelhardt, Friedrich
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 November 19, 1974. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 19, 1991.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedNovember 19, 1974
Term endedNovember 19, 1991
Patent numberCA 957930 A
Classification (IPC)E04F13/14 +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.