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:
Jun. 11, 1991
Filed:
Oct. 18, 1989
Takao Matsunami, Hirakata, JP;
Hidenori Okuda, Shiga, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An optical sensor comprising a light detector, a converging lens located between the light detector and a light source, the light rays from which are detected by the light detector, and a light shielding means provided on a part of the converging lens, the shielding means shielding light rays emitted from the light source, thereby reducing dependence of the amount of light rays to be detected upon angles of incidence with which the light rays enter into the converging lens of the optical sensor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile