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:
Jan. 30, 1979
Filed:
Aug. 16, 1977
Applicant:
Inventor:
David S Wise, Solon, OH (US);
Assignee:
McGraw-Hill, Inc., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
353 78 ; 353 99 ;
Abstract
An optical projection apparatus having foldable mirror members which permit the apparatus to be folded into a rigid, compact assembly for ease of installation and transportation. The apparatus comprises a double triangulated optical mirror structure which is interdependently mounted with the projector and screen without reference to the base section. The double triangulated structure provides the required optical rigidity while also folding or collapsing of the apparatus to reduce critical outer dimensions.