Polyvinylidene fluoride membrane
CA 2128296 A1 · Owner: Degen, Peter John · Inventors: Sipsas, Ioannis P.; Rapisarda, Gregory C.; Degen, Peter John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an isotropic skinless, porous, polyvinylidene fluoride membrane having a KUF of at least about 15 psi, and preferably below about 50 psi, when tested using liquid pairs having an interfacial tension of about 4 dynes/cm. The present inventive membrane preferably has a titer reduction of at least about 108 against T1 bacteriophage more preferably, also against PR772 coliphage and even more preferably, also against PP7 bacteriophage. The present inventive membrane can have a thickness of about 20 mils or less and even as low as about 5 mils or less. The present invention also provides a method of preparing such a membrane by providing a casting solution …
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 July 18, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 18, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 18, 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.