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. 25, 1978
Filed:
May. 27, 1977
Applicant:
Inventors:
Anthony John Springthorpe, Richmond, CA;
Michael John Rider, Kanata, CA;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
156642 ; 156345 ; 156640 ; 156644 ; 156655 ; 156659 ; 156662 ; 252 795 ;
Abstract
For aligning holes in substrates with the light emitting regions of light emitting diodes, particularly Burrus type diodes, an etchant based on an alkaline peroxide solution is ejected or sprayed onto the masked surface of the substrate. The etchant is selective and also avoids production of insoluble oxides in partially etched holes, as often happens in conventional processes. The invention is particularly applicable to producing holes through substrates to align optical fibres with the light emitting regions.