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:
Jul. 07, 1992
Filed:
Feb. 28, 1991
Applicant:
Inventor:
Alfons Hesse, Lennestadt, DE;
Assignee:
Tracto-Technik Paul Schmidt Maschinenfabrik KG, Lennestadt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; F16L / ; F16L / ;
U.S. Cl.
CPC ...
175295 ; 30 925 ; 175296 ; 405156 ; 405184 ;
Abstract
A percussion boring machine for destructive replacement of buried pipelines, having an opening-out cone at the back of the machine housing and cutters spaced in front of said cone, wherein the cutters form part of a breaking-up head slipped on to the housing and the opening-out cone is likewise slipped on to the housing.