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. 08, 1996
Filed:
Aug. 30, 1995
Applicant:
Inventors:
Dale R Wolfer, Salem, VA (US);
Leland H Lyon, Roanoke, VA (US);
Assignee:
Ingersoll-Rand Company, Wookcliff Lake, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175296 ; 175320 ; 173208 ; 173 73 ;
Abstract
A fluid-actuated, percussive, down-the-hole drill having a piston slidingly supported in a casing and passageways for transmitting flow of percussive fluid to actuate the piston is provided with self-lubricating bearings and self-lubricating seals within the drill to provide a drill requiring no oil lubrication.