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:
May. 12, 1981
Filed:
Oct. 30, 1979
Applicant:
Inventors:
Norio Ohta, Hachioji, JP;
Fumihiko Ishida, Hachioji, JP;
Tadashi Ikeda, Kodaira, JP;
Keikichi Ando, Musashino, JP;
Yutaka Sugita, Tokorozawa, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428336 ; 252 6257 ; 365 33 ; 427128 ; 428900 ; 428692 ;
Abstract
A garnet film for a magnetic bubble domain device which comprises a predetermined quantity of Gd and a predetermined quantity of Ga. The garnet film has a temperature coefficient of not more than 0.2%/.degree.C. in respect of the bubble collapse field owing to the addition of Gd and Ga and is suitable for substaining small magnetic bubbles of a diameter of less than 2.5 .mu.m.