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:
Feb. 21, 1995
Filed:
Aug. 09, 1993
Naoyuki Kitamura, Ikeda, JP;
Kenichi Kinugawa, Ikeda, JP;
Jun Matsuoka, Ikeda, JP;
Kohei Fukumi, Ikeda, JP;
Isao Kondoh, Ikeda, JP;
Saburo Kose, Ikeda, JP;
Hiroshi Yamashita, Kawanishi, JP;
Makoto Kinoshita, Ikeda, JP;
Agency of Industrial Science and Technology, Tokyo, JP;
Abstract
A process for producing a glass having a rod refractive index distribution, which includes pressing a glass at a temperature below the glass transition temperature to form a glass having a density increased towards the surface layer thereof, or alternatively includes heating a glass at a temperature around the transition temperature at the lowest to prepare glass having a uniformly enhanced density and heating the treated glass under a pressure lower than the applied pressure at a temperature below the glass transition temperature of the glass to prepare a rod glass having a density increased towards the central portion.