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. 14, 2015
Filed:
Nov. 25, 2011
Yoshinori Kotani, Yokohama, JP;
Zuyi Zhang, Yokohama, JP;
Akira Sugiyama, Yokohama, JP;
Kenji Takashima, Tokyo, JP;
Naoyuki Koketsu, Kawasaki, JP;
Yoshinori Kotani, Yokohama, JP;
Zuyi Zhang, Yokohama, JP;
Akira Sugiyama, Yokohama, JP;
Kenji Takashima, Tokyo, JP;
Naoyuki Koketsu, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention provides a porous glass with a varied porous structure that shows an excellent optical performance. A method of manufacturing a porous glass comprising: a first step of forming a surface layer containing a boron compound and an alkali metal compound as main ingredients on a matrix glass containing a silicon oxide, a boron oxide and an alkali metal oxide; a second step of heat treatment the matrix glass and the surface layer for phase separation to form a phase-separated glass; and a third step of acid treatment the phase-separated glass to form the porous glass having pores.