Thin, resin-saturable aromatic polyamide paper and process for making same
CA 2017556 C · Owner: E. I. Du Pont De Nemours And Company · Inventors: Sullivan, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A nonwoven, flexible sheet and process for making same consisting essentially of a comingled mixture of about 55 to about 75% by weight short fibers of poly(meta-phenylene isophthalamide) and about 25 to about 45% by weight fibrids of poly(meta-phenylene isophthalamide). The sheet has a basis weight of between about 10 and about 25 g/m2 and a thickness of between about 25 and about 45 microns and is impregnatable with resins or silicone oils.
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 May 25, 1990 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 25, 2012.
- 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.