Acrylic star polymers
CA 1253271 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Spinelli, Harry J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
TITLE, Acrylic Star Polymers, ABSTRACT Large star polymers, including acrylics are, made preferably by group transfer polymerization techniques by arm-first, core-first, or arm-core-arm approaches. The star polymers may be used in coatings and as tougheners for plastic sheeting. In addition, the polymers may be cast, blown spun or, sprayed to form e.g. fibre, film sheet composite, materials, multilayered coatings photoresists, adhesives, coupling agents and the like.
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
- Granted April 25, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 2006.
- 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.