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:
Sep. 19, 2006
Filed:
Dec. 17, 2002
Applicants:
Masato Sakai, Ibaraki, JP;
Satoru Matsuno, Ibaraki, JP;
Masanori Watanabe, Ibaraki, JP;
Chikai Yoshimizu, Ibaraki, JP;
Inventors:
Masato Sakai, Ibaraki, JP;
Satoru Matsuno, Ibaraki, JP;
Masanori Watanabe, Ibaraki, JP;
Chikai Yoshimizu, Ibaraki, JP;
Assignee:
Hitachi Koki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 17/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
A cover which covers outer peripheries of fastening screws are disposed on an outer periphery of a hammer case. A stopper which detachably positions and fixes the cover to the outer periphery of the hammer case is disposed.