Method for joining ultra high molecular weight polyethylene
CA 2083773 A1 · Owner: Yother, Harold F. · Inventors: Devlin, Michael J.; Vanmiddlesworth, David R.; Seymour, Kenneth A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of the Invention, Articles for food use are made by bonding ultra high molecular weight polyethylene surfaces. The surfaces are cleaned to remove grease and dirt. The surfaces are immobilized in spaced relation to each other with a rigid support abutting the surfaces. The surfaces are softened and a filler material surface softened with hot inert gas to make the outermost portion of each surface transparent. The filler material is pressed into the joint or gap between the immobilized surfaces. The article is cooled and removed from the rigid support surface.
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 November 25, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 2014.
- 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.