Polytrialkylgermylpropyne polymers and membranes
CA 1281474 C · Owner: Air Products And Chemicals, Inc. · Inventors: Lescher Savoca, Ann C.; Langsam, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a group of new polymers and treated semi-permeable, polymeric membranes made from the new polymers having, improved selectivity for separating components of a gas mixture. The membrane is provided by fluorinating a polymer cast into membrane form having the general structural formula: Wherein R1 is H or a C1-C2 alkyl group: R2 and R3 are independently linear or branched C1-C6 alkyl groups; R4 is a linear or branched C1-C12 alkyl or aryl group; X is a C1-C3 alkyl group or phenyl; m is at least 100; and n is 0 or 1.
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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 March 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.