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:
Jul. 06, 1993
Filed:
May. 03, 1991
Applicant:
Inventors:
John R Hines, Richardson, TX (US);
Ralph H Johnson, Plano, TX (US);
Richard Kirkpatrick, Richardson, TX (US);
Assignee:
Honeywell Inc., Minneapolis, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
437228 ; 437901 ;
Abstract
A structure is formed from two layers of material having opposite conductivity types. A first region is formed within the structure, and extends at least in part into a layer to be etched. A surface of the structure is then masked and etched. The result is a microstructure which varies with the conductivity type and geometry of the region formed and etchant used.