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:
Aug. 10, 1993
Filed:
Aug. 05, 1991
Applicant:
Inventor:
Dah Y Cheng, Los Altos Hills, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359852 ; 359867 ; 359869 ; 372 99 ; 362296 ; 362347 ; 362350 ;
Abstract
A reflecting surface which is open at least at one axial end and in an axial section conforms to an axial section through a geometric surface generated by rotating a parabolic curve about an axis normal to the parabola axes. An elongated source/sink extends along the axis of the reflecting surface and is at least partly enveloped by that surface.