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:
Jan. 27, 1981
Filed:
Jun. 21, 1979
Applicant:
Inventors:
Kevin M Foley, Maumee, OH (US);
David I VanderHooven, Maumee, OH (US);
Jerry D Hull, Tulsa, OK (US);
Assignees:
The Andersons, Maumee, OH (US);
Rotary Drilling Services, Inc., Maumee, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252 / ; 175 72 ;
Abstract
By separating the woody ring portion of corncobs from the pith and chaff portions a lost circulation additive for drilling muds is produced which does not appreciably increase the yield point of the drilling mud. Improved particle size distributions for lost circulation additives is also given and claimed which permits low concentrations of the additive to produce seals withstanding 1000 psig.