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. 11, 2003
Filed:
Feb. 22, 2001
Applicant:
Inventor:
Michael C. Thompson, Southern Pines, NC (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 0/718 ;
U.S. Cl.
CPC ...
E21B 0/718 ;
Abstract
A self-contained excavation device, with specific application as a beach umbrella excavator and anchor apparatus, includes a cutting head with a stepped cutting edge to penetrate thin shell layers, recesses defining anchor shelves to prevent pullout from wind, and anchor sweep faces for severing a structural connection between the compacted formation material and the recesses for easy removal of the device. The self-contained excavation device also includes a pressure limit chamber to prevent overpressure of the drilling fluid, a floating piston with straight intake ports for easy maintenance, and a self-cleaning valve to prevent debris from accumulating and clogging the valve.