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. 09, 2010
Filed:
Jan. 17, 2008
Applicant:
C. Warren Duncan, Santa Ana, CA (US);
Inventor:
C. Warren Duncan, Santa Ana, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 10/02 (2006.01); E21B 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A hole coring system for drilling large diameter holes with a handheld tool. The drill bit is guided by a mandrel attached to the concrete and serves as a central guidepost that ensures precise centering of the drill bit. Commonly available tools may be used to rotate the drill bit. A lever arm may be attached to the tool and used to resist any torquing action. Additionally, a brace may be attached to the lever arm which may be used to resist any torquing action.