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:
Dec. 13, 1977
Filed:
Sep. 20, 1976
Applicant:
Inventors:
Robert R Thomas, Chino, CA (US);
Camille C Thomas, Chino, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G03B / ;
U.S. Cl.
CPC ...
354295 ; 350147 ; 350317 ; 354 76 ;
Abstract
Filter case rotatably carries two filter retainers each with a linearly polarized filter, each at the same angular position. A perforated belt engages around the sprocket teeth on the filter retainers so that the two filters are rotated together. Filter case is removably attached to the camera body.