The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1979
Filed:
Oct. 19, 1977
Edward E Schmitt, Palo Alto, CA (US);
Alza Corporation, Palo Alto, CA (US);
Abstract
Poly(orthoester) co- and homopolymers and poly(orthocarbonate) co- and homopolymers comprising (1) a repeating dioxycarbon unit in the polymeric backbone having a plurality of organic groups pendant therefrom, and (2) a bridging moiety having at least one carbonyloxy group contained therein are disclosed. The polymers are represented by the formula: ##STR1## WHEREIN R is a bridging moiety and is either R.sub.1 or R.sub.2 arranged in a random manner along the polymeric backbone to form a copolymer containing both R.sub.1 and R.sub.2 with R.sub.1 an aliphatic, an alicyclic or an aromatic group and R.sub.2 is a ##STR2## GROUP WITH R.sub.1 as defined and R.sub.3 an aliphatic, an alicyclic or aromatic group, or wherein R is a bridging moiety and is only R.sub.2 to form a homopolymer with R.sub.1, R.sub.2, and R.sub.3 as defined above, and a is 0 to 1, b is 2 to 6, and n and the sum of x and y are positive integers. The copolymers are useful for making articles of manufacture, including devices and coatings for delivering beneficial agents.