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:
Jun. 07, 1994
Filed:
Apr. 10, 1992
Applicant:
Inventor:
Masao Yamada, Tokyo, JP;
Assignee:
Tanoi Mfg. Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23G / ;
U.S. Cl.
CPC ...
408222 ; 470198 ;
Abstract
In a tap having a lead part and a complete thread part contiguous to the lead part, a relief is formed on at least one of a leading flank and a following flank of each of a plurality of thread ridges formed on the rear end side of the lead part and each of a plurality of thread ridges formed on the front end side of the contiguous complete thread part, so that the portion of an internal thread having been cut already by the preceding cutting edge may not be cut again and widened by the succeeding cutting edge.