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:
Feb. 14, 1995
Filed:
Oct. 23, 1992
Applicant:
Inventor:
Heinz Gruber, 3370 Seesen/Rhuden, DE;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F21B / ;
U.S. Cl.
CPC ...
175323 ; 1753252 ; 175394 ;
Abstract
A boring tube has at least one tubular base body having a throughgoing longitudinal passage and an outer side and a coil arranged on the outer side of the base body and extending over its whole length. The coil has a pitch of 1 m-3 m and a radial width which starting from the outer side of the base body is at least 10 mm.