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. 25, 1995
Filed:
Jan. 07, 1991
Applicant:
Inventors:
Jean-Louis Tayot, La Tour de Salvagny, FR;
Michel Tardy, Lyons, FR;
Assignees:
Pasteur Merieux Serums et Vaccins, both of, FR;
Imedex, both of, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07K / ;
U.S. Cl.
CPC ...
435 681 ; 530356 ;
Abstract
Human or animal placenta is subjected to moderate enzymatic digestion, in particular with pepsin at an acid pH, then, after separation of the residual tissue the impurities are separated at a moderately acid pH, the collagen is precipitated at a neutral pH, redissolved and the residual impurities precipitated at an acid pH. The collagen obtained can be brought back to a neutral pH and dried in the form of fibres. Completely transparent, physiological and hemocompatible gels and solutions can be prepared. Applications for the fabrication of contact lenses and implants.