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:
Jun. 18, 1996
Filed:
Nov. 08, 1994
Applicant:
Inventor:
R Russel Austin, Novato, CA (US);
Assignee:
Photran Corporation, Lakeville, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
348835 ; 348834 ; 348818 ;
Abstract
A privacy filter (20) for a display device includes at least two spaced-apart, generally parallel grids (22 and 24). Each grid includes an array of strips (26 and 30) or blocking members having transparent space (28 and 32) therebetween. The strips or blocking members are formed aligned such that an image (37) displayed on the display device may be viewed through the filter at an angle of incidence within a predetermined range of angles but is not discernable at angles outside of the predetermined range.