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:
Oct. 31, 1978
Filed:
Sep. 02, 1977
Applicant:
Inventor:
Norman W Schuler, Lexington, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05D / ; G02B / ;
U.S. Cl.
CPC ...
350159 ;
Abstract
A window construction adapted to permit or prevent light transmission including first and second fixed polarizer panels and a moveable panel between the polarizer panels comprising a polarizer and a wave retarder. The first fixed polarizer panel comprises adjacent polarizers which are in the same plane and have their absorption axes perpendicular to each other. The absorption axes of the polarizer panels are positioned so that maximum or minimum light transmission through the construction is effected by moving the panel including the wave retarder between the fixed polarizer panels.