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. 17, 1991
Filed:
Jul. 25, 1989
Applicant:
Inventors:
Assignee:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359896 ; 425268 ; 51 5 / ; 359900 ; 359642 ; 385 85 ;
Abstract
In a method and apparatus for forming a curved surface, a polishing plate consisting of a film-like elastic member is supported at two positions, i.e., central and peripheral portions thereof, and is rotated while two cylinders having different heights and diameters are urged upward against portions between the central and peripheral portions of the polishing plate, and an object to be processed is urged downward against a surface formed between the two cylinders while the object is rotated, thereby forming a curved surface.