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:
Mar. 06, 1990
Filed:
Nov. 28, 1988
Applicant:
Inventor:
Jack T Anderson, Independence, OH (US);
Assignee:
N. P. K. Construction Equipment, Inc., Walton Hills, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
299 37 ; 299 69 ; 299 94 ; 173133 ;
Abstract
An improved ripper using a hydraulic hammer with a rotating long service life hammer tool is provided. The tool is cylindrical with a large cylindrical upper portion and a central portion of reduced diameter. The tool is retained in the hammer by means of a pin passing through the tool cavity of the hammer housing which prevents passage of the large upper portion.