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:
Jul. 11, 1978
Filed:
Aug. 23, 1976
Applicant:
Inventor:
Allan Victor Gould, London, GB;
Assignee:
Thorn Electrical Industries Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F21M / ; F21P / ;
U.S. Cl.
CPC ...
362308 ;
Abstract
In a beam-projecting lamp such as a vehicle headlamp or theatre spotlight which has a mask to delimit the edge of the beam, color fringing due to the mask is reduced by the use of a mask having separate front and rear edges or by splitting the projection lens into upper and lower halves, the arrangement in each case producing both a virtual erect mask image from one half of the projection lens and a real inverted mask image from the other half.