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. 01, 1994
Filed:
Apr. 03, 1992
Applicant:
Inventor:
Franz-Josef Puttmann, Lennestadt-Saalhausen, DE;
Assignee:
Tracto-Technik Paul Schmidt Spezialmaschinen KG, Lennestadt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175 61 ; 173105 ; 173203 ; 175 62 ; 175 73 ; 175122 ; 175135 ; 175162 ;
Abstract
In a method of operating a ram boring machine having a rotatory-thrust drill rod an impact force is applied to the rear end of the drill rod. The boring machine includes a thrust unit and a striking tool that are combined to form a thrust/percussion aggregate.