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:
Apr. 22, 1980
Filed:
May. 17, 1978
Applicant:
Inventor:
Philip J Rogers, Clwyd, GB;
Assignee:
Pilkington P. E. Limited, St. Helens, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G02B / ; G02B / ;
U.S. Cl.
CPC ...
350-12 ; 350-13 ; 350-14 ; 350 38 ; 3501 / ; 350183 ; 350189 ; 350212 ; 350-61 ;
Abstract
The 'eye-piece' for a non-Gallilean afocal infra-red telescope comprises a front element which is meniscus with a convex back surface of greater radius of curvature than its concave front surface but which has a thickness such that it is of positive power, and a back element of positive power with a convex front surface and a convex or concave back surface. Such an 'eye-piece' can be used in combination with a variety of objective lens systems.