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:
Jan. 01, 2002
Filed:
Apr. 30, 1997
Applicant:
Inventors:
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B 1/112 ;
U.S. Cl.
CPC ...
C03B 1/112 ;
Abstract
A method for forming a glass optical element by press forming a thermally softened glass material with a preheated forming mold composed of an upper and a lower die. The glass material, the upper die and the lower die are heated within respectively prescribed temperature ranges, the preheating temperature of the upper die being below the preheating temperature of the lower die. The thermally softened glass material is pressed in the preheated forming mold, and the forming surfaces of the upper and the lower dies are cooled simultaneously with the start of the initial pressing, during the process of the initial pressing, or after the completion of the initial pressing.