Expired Canadian patentCanada
Process for improving the filterability of asbestos fibers
CA 1196754 A · Owner: Asarco Incorporated · Inventors: Puskar, Victor
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Asbestos fibers are treated with sodium aluminate to improve their water filtration characteristics and are particularly useful for forming fast filtering asbestos cement slurries which are used to make asbestos cement pipe and other formed cement objects.
Read 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, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 19, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 21, 1983
GrantedNovember 19, 1985
Term endedNovember 19, 2002
Patent numberCA 1196754 A
Classification (IPC)C04B14/40 +1 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.