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. 25, 1979
Filed:
Dec. 01, 1977
Applicant:
Inventors:
Wolfram Schultheiss, Birkenau, DE;
Klaus Schmidt, Hirschberg, DE;
Assignee:
Firma Carl Freudenberg, Hohnerweg, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ;
U.S. Cl.
CPC ...
428288 ; 2105 / ; 210507 ; 427194 ; 428297 ; 428332 ; 428303 ; 428340 ; 428402 ; 428903 ;
Abstract
A nonwoven fabric having a smooth surface, especially for use as support material for semipermeable membranes, comprising a support mat into which at least one surface thereof, an open-structured, continuous covering layer of fine, thermoplastic particles is calendered.