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:
Mar. 13, 1990
Filed:
Aug. 24, 1988
Applicant:
Inventors:
Richmond R Cohen, Hockessin, DE (US);
Jimmie D McCarty, Arden, DE (US);
Assignee:
Hercules Incorporated, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A24D / ; A24D / ; A24D / ;
U.S. Cl.
CPC ...
131332 ; 131334 ; 131343 ;
Abstract
Filter element and method for increasing the hardness thereof by contacting filter plug material with effective amounts of (a) a water soluble resin (or copolymer) having available chelate bond-forming chemical groups and (b) a water soluble nontoxic salt, the metal cation of the nontoxic salt forming a chelate bond with the chelate bond-forming chemical groups of said water soluble resin.