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:
Apr. 14, 1998
Filed:
Feb. 10, 1997
Applicant:
Inventors:
Osamu Kagaya, Hachiouji, JP;
Hiroyuki Takazawa, Hino, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ; H01L / ;
U.S. Cl.
CPC ...
257192 ; 257194 ; 257612 ;
Abstract
A compound semiconductor integrated circuit having a high resistance layer consisting of a compound semiconductor to which oxygen is added as an impurity and an undoped compound semiconductor layer which are formed between a semi-insulating substrate and field effect transistors formed thereon sequentially from the semi-insulating substrate side is suited to a superspeed operation because the low frequency oscillation is suppressed.