US Patent 7415842 Optical glass element and manufacturing method thereof

Patent 7415842 was granted and assigned to Konica Minolta on August, 2008 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Konica Minolta

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

74158420

Patent Inventor Names

Tadafumi Sakata0

Tadashi Sugiyama0

Date of Patent

August 26, 2008

Patent Application Number

109409420

Date Filed

September 14, 2004

Patent Primary Examiner

‌

Steven P. Griffin

Patent abstract

The present invention relates to a manufacturing method for an optical glass element, in which molten glass 9 is pressed between a lower mold 1 and an upper mold 8, and the pressing process is carried out while maintaining a space 10 between a border area (5, 6) of a molding face 2 belonging to the lower mold 1 and a circumferential face 3 located on the periphery thereof and glass 9, and an optical glass element manufactured by such a method.