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:
Nov. 30, 1976
Filed:
Jul. 17, 1975
Applicant:
Inventors:
Sally Lee Adams, Pittsburgh, PA (US);
Lawrence James Guilbault, McMurray, PA (US);
Fred David Martin, McMurray, PA (US);
Assignee:
Calgon Corporation, Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08K / ;
U.S. Cl.
CPC ...
260 / ; 166295 ; 260 4213 ;
Abstract
Improved cementing compositions and their use in well cementing operations is disclosed, wherein polyvinylpyrrolidone-polyacrylamide triblock polymers are used as fluid loss additives for aqueous hydraulic cement slurries.