Method for reducing hollow glass sphere fracture in thermoplastic resin by in situ polymerization/extrusion
CA 2013209 C · Owner: The B.F. Goodrich Company · Inventors: Eckstein, Yona; Wilson, Gary F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An in situ polymerized thermoplastic resin incorporating hollow glass spheres, which are incorporated during polymerization of the resin and, a method of making a concentrate of hollow glass spheres dispersed in a thermoplastic resin with minimal sphere fracture by adding the spheres during polymerization of the resin.
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 March 28, 1990 and granted May 29, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 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.