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. 24, 1990
Filed:
May. 17, 1989
Applicant:
Inventors:
Etienne G Colas, Asbury Park, NJ (US);
Alfredo Yi-Yan, Eatontown Boro, NJ (US);
Assignee:
Bell Communications Research, Inc., Livingston, NJ (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350 9612 ; 350 9631 ;
Abstract
A planar waveguide comprises a semiconductor substrate having one or more grooves along the surface of the substrate. A plurality of sequences of superlattice layers separated by a spacer layer over the grooved substrate is provided. The number of superlattice periods in each sequence changes from the base of the groove to the surface of the waveguide so as to provide a graded index of refraction in at least a portion of the region above the groove.
Colas, Etienne. (1990). Graded-index waveguides (U.S. Patent No. 4919504). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4919504
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile