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. 23, 1976
Filed:
Oct. 04, 1974
Applicant:
Inventor:
Nobuhisa Ikeda, Yokohama, JA;
Assignee:
Tone Boring Company Limited, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175319 ;
Abstract
A boring apparatus in which a plurality of drill bits are supported in a casing fixed to a boring pipe in such a manner that these bits are axially substantially parallel with the axis of the boring pipe and are freely rotatable around their own axis independently of the rotation of the boring pipe.