An oil-and water-repellent gas-permeable filter
CA 2117675 C · Owner: Japan Gore-Tex Inc. · Inventors: Sugiyama, Norihide; Moriyama, Sumihiro; Sasaki, Fumihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A oil and water-repellent filter which contains a porous filter material that has its internal and external surfaces coated with a compound formed by combining a fluroropolymer having a fluorine-containing aliphatic cydic structure in the main chain and a fluoropolymer containing polyfluroalkyl groups. The coating imparts superior oil- and water-repellency without impaimnent to the flow of air or other gases through the filter.
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
- Filed September 8, 1994 and granted June 22, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 8, 2016.
- 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.