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:
Jul. 10, 2001
Filed:
Mar. 21, 1996
Manfred Zamzow, Aachen, DE;
Hartwig Hocker, Aachen, DE;
The Procter & Gamble Company, Cincinnati, OH (US);
Abstract
Process for the manufacture of polymers having repeating units comprising spiro orthoester groups of general formula (I), wherein A is C,-alkylene, C,-alkyleneoxycarbonyl or an oxygen-carbon bond, R,is hydrogen or methyl, R,is C,-alkyl or C,-alkyl substituted by C,-alkoxy or aryloxy, R,and R,independently are hydrogen or C,-alkyl, R,is hydrogen or methyl, R,is hydrogen, methyl, phenyl, carboxy, carboxy-C,-alkyl, carboxamido or cyano, n is an integer >1 and m is 0 or an integer ≧1, with the proviso that the molecular weight of the polymer is between 500 and 1,000,000, the polymers obtained and their use specifically in dental filling materials.