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:
Oct. 03, 1978
Filed:
Mar. 30, 1977
Applicant:
Inventors:
Howard Ward, Newport Beach, CA (US);
John Tschirky, Long Beach, CA (US);
Assignee:
Smith International, Inc., Newport Beach, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175 53 ; 175 62 ; 175107 ; 405184 ;
Abstract
A hole-opener and a hole-opener apparatus is provided for enlarging a pilot hole of the inverted arcuate type which bypasses an obstacle, the pilot hole having an entrance and terminal end, both ends usually being accessible to surface drilling equipment.