Process for improving the surface of liquid crystal polymers
CA 2045272 C · Owner: E.I. Du Pont De Nemours And Company · Inventors: Adcock, David Frederick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Surfaces of articles molded from unfilled or lightly filled liquid crystal polymers have a tendency to peel away when subjected to even slight rubbing. Such surfaces are improved by subjecting them to abrasion to remove at least 0.01 mm of surface thickness, whereby they acquire a smooth matte finish and are no longer susceptible to peeling.
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 June 21, 1991 and granted October 9, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 2013.
- 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.