Blow-molded polyphenylene sulfide articles
CA 2011683 C · Owner: Bailey, Fay W. · Inventors: Bailey, Fay W.; Ryan, Charles L. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Articles are blow-molded from a polyphenylene sulfide resin having a melt flow in a range of from about 1 to about 10 g/10 min. and preferably in a range of from about 4 to about 8 g/10 min. When filler materials such as mica are added, the upper end of the acceptable melt flow range is raised to about 15 g/10 min. By maintaining mold temperatures in a range of from about 250° to about 400° F. and preferably from about 275° to about 325° F. the polyphenylene sulfide material in the blow-molded article is provided with a semi-crystalline structure and is dimen-, sionally stable at temperatures of at least 500° F. Filler materials are preferably provided in a range of from about 10 to about …
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 7, 1990 and granted October 11, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 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.