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. 06, 1987
Filed:
Apr. 01, 1985
Applicant:
Inventor:
John F Dreyer, Jr, North Oaks, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
353 98 ; 353D / ;
Abstract
An overhead projector includes a projection head which contains a pivoting mirror and a pivoting projection lens interconnected by a linkage. Rotation of the mirror causes rotation and translation of the projection lens and automatically corrects for Scheimpflug distortion and loss of overall focus of the projected image.