Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1983-04-26
1985-06-25
Smith, William
Glass manufacturing
Processes
Forming product or preform from molten glass
65 31, C03C 1502
Patent
active
045251894
ABSTRACT:
A process for producing a glass product having .DELTA.n, the difference between the central and peripheral portions of the glass, greater than 0.04. This process utilizes a porous glass body which is produced via a phase separation technique. A dopant selected from the group consisting of (1) TlNO.sub.3, (2) TlNO.sub.3 and an alkali metal compound and (3) TlNO.sub.3, Pb(NO.sub.3).sub.2 and an alkali metal compound is then permeated into the micropores of the porous glass product. A concentration gradient of the dopant is then formed by leaching out a portion of the dopant from the micropores. After the dopant is solidified in the micropores, the porous glass product is dried. A heat-treatment step then serves to collapse the micropores. A glass product having a gradient of refractive indices is thereby obtained.
REFERENCES:
patent: 3938974 (1976-02-01), Macedo et al.
patent: 4110093 (1978-08-01), Macedo et al.
patent: 4110096 (1978-08-01), Macedo et al.
patent: 4225330 (1980-09-01), Kakuzen et al.
patent: 4389233 (1983-06-01), Kurosaki et al.
Asahara Yoshiyuki
Ohmi Shigeaki
Sakai Hiroyuki
Shingaki Seiichi
Boyer Michael K.
Hoya Corporation
Smith William
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