Title: Ion exchangeable glass having low thermal expansion

Abstract: For producing gradient refractive index optical components having substantially no internal stress, there is provided for the ion exchange step glass of the following composition PRETEXTREPLACED

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Inventors: Gliemeroth, Georg (Finthen, DT)

Application Number: 636843
Filing Date: 1975-12-02
Publication_date: 1977-07-26
Assignee: Jenaer Glaswerk Schott & Gen. (Mainz, DT)
Primary Class(es): 428/212 501/61, 501/62, 501/63, 501/64
Other Classes:
US Patent Ref:

3486808	Dec, 1969	Hamblen	65/30.
3533888	Oct, 1970	Eppler et al.	65/30.
3898093	Aug, 1975	Faulstich et al.	106/54.
3954487	May, 1976	Gliemeroth et al.	106/54.

Other Refs:
Primary Examiner: Douglas, Winston A.
Assistant Examiner: Bell, Mark
Attorney: Millen & White