US3941605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible light-sensitive glass
Assignee: Hoya Glass Works Ltd
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Filing: 1974-07-31
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Granted: 1976-03-02
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Expires: 1994-07-31
Abstract
Abstract A reversible light-sensitive glass, e.g., for eyeglasses, comprising 100 parts of a base glass composition consisting, in weight percent, of 48 to 62% SiO 2 , 15 to 22% B 2 O 3 , 0 to 11% Al 2 O 3 , 0 to 10% ZrO 2 , 6<Al 2 O 3 + ZrO 2 <13%, 6 to 16% R 2 O where R represents Li, Na or K, 0.5 to 7% BaO, BaO/R 2 O 0.035 to 0.65, 0 to 2% TiO 2 , 0 to 2.5%Nd 2 O 3 , 0 to 2.5% Ho 2 O 3 , 0 to 2.5% Er 2 O 3 , 0.2<Nd 2 O 3 + Ho 2 O 3 + Er 2 O 3 <2.5% and 0.002 to 0.03%CuO, and as light-sensitive components 0.15 to 1.0 part of Ag and more than the Ag chemical equivalent of halogens selected from the group consisting of Cl, Br and I.
Inventors
- 👤 Toshiharu Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:09
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/04; C03C4/06; C03C3/00; C03C3/04; C03C3/076; C03C3/095; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
158 words
A reversible light-sensitive glass comprising 100 parts of a base glass composition consisting, in weight percent, of 48 to 62% SiO 2 , 15 to 22% B 2 O 3 , 0 to 11% Al 2 O 3 , 0 to 10% ZrO 2 , 6<Al 2 O 3 + ZrO 2 <13%, 6 to 16% R 2 O where R represents Li, Na or K, 0.5 to 7% BaO, a BaO/R 2 O ratio of 0.035 to 0.65, 0 to 2% TiO 2 , 0 to 2.5% Nd 2 O 3 , 0 to 2.5% Ho 2 O 3 , 0 to 2.5% Er 2 O 3 , 0.2<Nd 2 O 3 + Ho 2 O 3 + Er 2 O 3 <2.5% and 0.002 to 0.03% CuO, and as light-sensitive components 0.15 to 1.0 part of Ag and more than the Ag chemical equivalent of halogens selected from the group consisting of Cl, Br and I.
Claim 2
Dependent Claim
158 words
A reversible light-sensitive glass comprising 100 parts of a base glass composition consisting, in weight percent, of 48 to 62% SiO 2 , 15 to 22% B 2 O 3 , 0 to 11% Al 2 O 3 , 0 to 10% ZrO 2 , 6<Al 2 O 3 + ZrO 2 <13%, 6 to 16% R 2 O where R represents Li, Na or K, 0.5 to 7% BaO, a BaO/R 2 O ratio of 0.035 to 0.65, 0 to 2% TiO 2 , 0 to 2.5% Nd 2 O 3 , 0 to 2.5% Ho 2 O 3 , 0 to 2.5% Er 2 O 3 , 0.2<Nd 2 O 3 + Ho 2 O 3 + Er 2 O 3 <2.5% and 0.002 to 0.03% CuO, and as light-sensitive components 0.15 to 1.0 part of Ag and more than the Ag chemical equivalent of halogens selected from the group consisting of Cl, Br and I.
Claim 3
Dependent Claim
33 words
A reversible light-sensitive glass according to claim 1 in which some or all of the Nd 2 O 3 is replaced by Sm 2 O 3 , PrO 2 , or mixtures thereof.
References Cited (Backward Citations)
US2805166A
Cited
US3269847A
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US3208860A
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US3328182A
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US3419370A
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US3795523A
Cited
US3594198A
Cited
US3706688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |