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:
Sep. 28, 1976
Filed:
Mar. 03, 1975
Applicant:
Inventors:
Terrence M Conder, Stillwater, MN (US);
Donald J Newman, White Bear Lake Township, Ramsey County, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G03B / ; B32B / ;
U.S. Cl.
CPC ...
350211 ; 353 38 ; 156106 ;
Abstract
Large area lens assembly, e.g., for an overhead projector, has glass stage bonded directly to plastic incremental lens to eliminate light-reflective interface and conserve space. Differential thermal expansion problems are overcome by critical selection of materials, dimensions and procedures. A unitary structure with multiple incremental lenses is made possible.