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:
Aug. 22, 1995
Filed:
Jan. 13, 1992
Applicant:
Inventor:
Lowell M Hobrock, Los Angeles, CA (US);
Assignee:
Hughes Aircraft Company, Los Angeles, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; H01L / ;
U.S. Cl.
CPC ...
359885 ; 359359 ; 257468 ;
Abstract
An optical filter for an infrared detector is provided by creating an impurity band in a semiconductor substrate onto which the infrared detector is epitaxially grown. The impurity band provides a range of absorption and a long wavelength pass band characteristic. The range of absorption is broadened by doping the substrate with a dopant of different photoelectric threshold from the dopant used to create the impurity band.