Expired Canadian patentCanada
Chemically durable porous glass and process for the manufacture thereof
CA 1257299 A · Owner: Agency Of Industrial Science & Technology · Inventors: Tanaka, Hiroshi; Eguchi, Kiyohisa; Yamaguro, Takao
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are a chemically durable porous glass of which the skeleton mainly comprises SiO2-ZrO2 system glass having a ZrO2 content of 2 or more wt % and a, process for the production of such glass.
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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 July 11, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 11, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 10, 1986
GrantedJuly 11, 1989
Term endedJuly 11, 2006
Patent numberCA 1257299 A
Classification (IPC)C03C11/00 +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.