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:
Mar. 12, 1991
Filed:
Sep. 14, 1988
Applicant:
Inventors:
Federico Capasso, Westfield, NJ (US);
Alfred Y Cho, Summit, NJ (US);
Susanta Sen, Scotch Plains, NJ (US);
Assignee:
AT&T Bell Laboratories, Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 34 ; 357 16 ; 357 / ; 357 57 ; 357 58 ; 357 / ;
Abstract
A plurality of decoupled quantum wells in a transistor device enables such device to operate with multiple-peak characteristics. The device is suitable for a variety of circuit applications in switching systems and in central processor logic units and memories; specific applications include frequency multipliers, waveform scramblers, parity-bit generators, analog-to digital converters, and multiple-valued logic units.