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:
Dec. 03, 1991
Filed:
Mar. 11, 1991
Masayuki Yamane, Yokohama, JP;
Atsuo Yasumori, Mitaka, JP;
President of Tokyo Institute of Technology, Tokyo, JP;
Abstract
A method of manufacturing a large-diameter gradient-index glass having a predetermined refractive index gradient includes the steps of (a) hydrolyzing a solution consisting of an alkoxide of silicon and an alkoxide of boron to prepare a sol, (b) adding an aqueous solution of lead acetate and an organic acid to the sol to prepare a gel porous body, (c) aging and sequentially treating the gel porous body by using a water-isopropanol solution of lead acetate, an isopropanol-acetone solution, and acentone, thereby performing a pretreatment, (d) dipping the pretreated gel porous body into a lower alcohol solution of at least one of potassium acetate and sodium acetate to form a lead ion concentration distribution which is gradually changed from a surface to an interior of the gel porous body, (e) sequentially treating the gel porous body having the lead ion concentration distribution by sequentially using an isopropanol-acetone solution and acentone, and (f) drying and heating the gel porous body to prepare a glass body.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile