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:
May. 13, 2008
Filed:
Sep. 18, 2003
Akira Masumura, Sagamihara, JP;
Muneo Nakahara, Sagamihara, JP;
Satoru Matsumoto, Sagamihara, JP;
Tatsuya Senoo, Sagamihara, JP;
Akira Masumura, Sagamihara, JP;
Muneo Nakahara, Sagamihara, JP;
Satoru Matsumoto, Sagamihara, JP;
Tatsuya Senoo, Sagamihara, JP;
Kabushiki Kaisha Ohara, Kanagawa-ken, JP;
Abstract
An optical glass wherein an amount of change in refractive index (Δn: difference in refractive index between a state before radiation and a state after radiation) caused by radiation of laser beam at wavelength of 351 nm having average output power of 0.43 W, pulse repetition rate of 5 kHz and pulse width of 400 ns for one hour is 5 ppm or below is provided. The optical glass comprises a fluorine ingredient and/or a titanium oxide ingredient and/or an arsenic oxide ingredient. The optical glass suffers little change in refractive index by radiation of strong light having wavelengths of 300 nm to 400 nm such as ultraviolet laser.