Semi-permeable membranes with an internal discriminating region
CA 1319476 C · Owner: The Dow Chemical Company · Inventors: Jensvold, John A.; Clark, Daniel O.; Sanders, Edgar S. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymeric matrices with two porous surfaces and a region which functions to separate one or more gases from one or more other gases are particularly useful as semi-permeable membranes. While maintaining excellent separation factors and flux, such membranes are less prone to being damaged due to handling and exposure to contaminants as the porous surfaces function to protect the internal region which effects the separation.
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
- Granted June 29, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 29, 2010.
- 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.