Expired Canadian patentCanada
Supported membrane and process for its preparation
CA 1306905 C · Owner: Bitter, Johan G.A. · Inventors: Bitter, Johan G.A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A supported membrane comprising a non-woven monofilament support layer wherein dense membranes with a maximum width of 5 mm are surrounded by filaments. The invention further relates to a process for the preparation of said supported membranes.
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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 September 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 19, 1986
GrantedSeptember 1, 1992
Term endedSeptember 1, 2009
Patent numberCA 1306905 C
Classification (IPC)B01D69/10 +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.