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. 06, 1990
Filed:
Apr. 13, 1988
Yoji Tasaki, Aichi, JP;
Koichi Kurokawa, Aichi, JP;
Katsuhide Hattori, Aichi, JP;
Mikio Takano, Tokyo, JP;
Toshikazu Miyajima, Yamato, JP;
Toshifumi Sato, Sagamihara, JP;
Katsura Ogasawara, Kodaira, JP;
Nippon Oil and Fats Company, Limited and Kajima Corporation, both of, JP;
Kajima Corporation, both of, JP;
Abstract
A laser beam-detonatable blasting cap containing secondary explosives charged therein in the upper and lower portions, wherein the explosive charged in the upper portion contains a laser beam-absorbing black material and is contacted with an optical fiber at the top. The loading density of the explosive charged in the lower portion is higher than that of the explosive charged in the higher portion, and only the side of the explosive charged in the upper portion is surrounded with a restraining wall. The blasting cap can be easily and surely detonated by a laser beam having a low peak output power generated by means of a pulse-oscillation system without using Q-switching or a continous oscillation system.