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. 10, 1990
Filed:
Jun. 26, 1989
Toshiro Hayakawa, Tokyo, JP;
Eastman Kodak Company, Rochester, NY (US);
Abstract
A semiconductor light-emitting device is provided with optical guide layers that include at least part of compositionally graded layers provided adjacent to the light-emitting layer, and at least one end of the compositionally graded layers is provided with a bridging layer wherein the first derivative of each composition profile with respect to the layer thickness is continuous. This provides an extremely smooth change of composition from one layer to the next, and eliminates problems such as overshoot and undershoot, and can be accomplished using a general control system based on PID.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile