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:
Dec. 27, 1988
Filed:
Jul. 27, 1987
Applicant:
Inventors:
Friedrich Engelhardt, Frankfurt, DE;
Manfred Schrod, Weiterstadt, DE;
Manfred Ziegelmayer, Bischofsheim, DE;
Josef Hilbig, Taunusstein, DE;
Reinhard Donges, Bad Soden, DE;
Assignee:
Cassella Aktiengesellschaft, Frankfurt, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
528492 ; 523315 ; 523332 ; 524833 ; 524916 ; 528493 ; 528495 ; 528496 ; 528499 ;
Abstract
A polymer hydrogel substantially free from monomers and oligomers is prepared by contacting a previously prepared polymer hydrogel with a single-phase mixture of water and a solvent and then separating the mixture of water and solvent from the hydrogel.