Polymeric orthoesters and process for making same
CA 1112798 A · Owner: Alza Corporation · Inventors: Capozza, Richard C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
ARC 506, PATENT APPLICATION OF ALZA CORPORATION ALZA DOCKET NO.: ARC 506, TITLE: POLYMERIC ORTHOESTERS AND PROCESS FOR MAKING SAME ABSTRACT OF THE DISCLOSURE, Polymeric orthoesters having a repeating mer of the general formula:, wherein R1 and R2 may be various substituted or unsubstituted hydrocarbon radicals and a is 2 or 3 are disclosed. These polymers are made by reacting a polyol of the formula (CH2OH)a R2(OH)3-a, with an orthoester of the formula R1C(OR3)3, wherein R3 may be various hydrocarbon radicals to form a monomer and polymerizing the monomer in the presence of a polymerization catalyst. These orthroester polyrners find use as erodible coatings in a number of environments such …
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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 November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.