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:
Nov. 18, 1997
Filed:
Aug. 30, 1995
William F Butterfield, Winchester, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
An optical filter assembly for use on a visual display device is disclosed. Included in the assembly is a frame defining a viewing aperture which frame is mounted on a visual display device such that the aperture is in registry with the screen of the visual display device. An optical filter is provided for covering the aperture. The frame assembly includes a plurality of side walls which extend the distance sufficient for reducing the passage of room light to behind the optical filter. The frame assembly also includes structure for holding releasably the optical filter to the frame assembly and structure associated with the frame assembly for spacing the optical filter from the display screen. Included is spacing structure which includes a protrusion intrical with the frame for contacting the display screen for thereby physically spacing the filter from the display screen.