Modified pet polymers and copolymers suitable for extrusion blow molding
CA 1265643 C · Owner: Baron, Joseph J. Jr. · Inventors: Doerr, Marvin L.; Mcchesney, Charles E.; Baron, Joseph J. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed an improved modified polymer suitable for use in making hollow containers by conventional extrusion blow molding. It is a specific type of end-capped and branched polyethylene terephthalate polymer or copolymer. In the improvement the end-cap comprises the reacted component of a difunctional acid or alkali metal salt of a difunctional acid having the formula:, wherein:, X has a valency of 6 and is selected from sulfur selenium, and tellurium;, M is an alkali metal or hydrogen; and Y is hydrogen or an aliphatic group containing from 1 to 18 carbon atoms. The preferred difunctional acid is msulfobenzoic acid. The product typically contains few large gels having diameters …
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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
- Granted February 6, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 6, 2007.
- 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.