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:
Feb. 02, 1988
Filed:
Apr. 29, 1985
Applicant:
Inventors:
Louis A Errede, North Oaks, MN (US);
George R Hunt, Mahtomedi, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
C12N / ; C12N / ; C12N / ;
U.S. Cl.
CPC ...
435182 ; 435174 ; 435177 ; 435180 ;
Abstract
A polytetrafluoroethylene (PTFE) fibril matrix is prepared containing entrapped viable cells such as animal, bacterial, fungal or yeast cells. Cells are blended with surfactant and soap-free PTFE in aqueous dispersion to form a damp paste. Water is added to the paste and a resultant stiff dough is biaxially calendered between calendering rolls to cause fibrillation and form the PTFE fibril matrix. Calendering is preferably carried out at a temperature of 5.degree. to 70.degree. C. and a pressure of 1000 to 3000 MPa. The fibril matrix may be dried.