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:
Jan. 15, 1991
Filed:
Jun. 15, 1989
Applicant:
Inventors:
Shuichi Satoh, Itami, JP;
Kazuwo Tsuji, Itami, JP;
Takeru Nakashima, Itami, JP;
Shuji Yazu, Itami, JP;
Yosio Nisida, Takatsuki, JP;
Kiyofumi Muro, Ichihara, JP;
Yuzo Demizu, Kamifukuoka, JP;
Masuo Nakagawa, Takamatsu, JP;
Moritami Okada, Osaka, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
423446 ; 156D / ; 365119 ; 501 86 ;
Abstract
A hole-burning material which comprises at least one hole which is formed on a zero-phonone line and semi-permanently lasts without suffering from any change in the temperature range from 2 to 120 K. and which can be erased by irradiation of excited light having an energy larger than the zero-phonone line, in which the burnt holes have long life and deep depth and any single holes can be erased.