US3870531A
Expired / Lapsed
US
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Optical flint glass with relatively low refractive indices and high dispersion
Assignee: Schott AG
•
Filing: 1972-07-17
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Granted: 1975-03-11
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Expires: 1992-07-17
Abstract
Abstract An optical flint glass having relatively low refractive indices from nd 1.65 to nd 1.87, high dispersions from Nu d 32 to Nu d 21 and varying relative partial dispersions.
Inventors
- 👤 Walter Jahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:05
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/062; C03C3/07; C03C3/102; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901; Y10S501/903
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
38 words
Optical flint glass with relatively low refractive indices from nd 1.68 to nd 1.87, a high dispersion from d 30 to d 21, and differing relative partial dispersions consisting essentially on a 100 percent total weight basis of
Claim 2
Dependent Claim
38 words
Optical flint glass with relatively low refractive indices from nd 1.68 to nd 1.87, a high dispersion from d 30 to d 21, and differing relative partial dispersions consisting essentially on a 100 percent total weight basis of
Claim 3
Dependent Claim
5 words
5-45% by weight of SiO2
Claim 4
Dependent Claim
5 words
5-45% by weight of SiO2
Claim 5
Dependent Claim
27 words
OPTICAL FLINT GLASS WITH RELATIVELY LOW REFRACTIVE INDICES FORM ND 1.68 TO ND 1.87. A HIGH DISPERSION FROM D 30 TO D 21, AND DIFFERING RELATIVE P
Claim 6
Dependent Claim
27 words
OPTICAL FLINT GLASS WITH RELATIVELY LOW REFRACTIVE INDICES FORM ND 1.68 TO ND 1.87. A HIGH DISPERSION FROM D 30 TO D 21, AND DIFFERING RELATIVE P
Claim 7
Dependent Claim
13 words
Optical flint glass in accordance with claim 1 in which (2) is K2O.
Claim 8
Dependent Claim
7 words
5-27% by weight of K2O and/or Na2O
Claim 9
Dependent Claim
7 words
5-27% by weight of K2O and/or Na2O
Claim 10
Dependent Claim
25 words
8-40% by weight of Nb2O5 and/or Ta2O5, said amount being sufficient to stabilize The glass against crystalization without intensifying the yellowish coloring of the glass
Claim 11
Dependent Claim
25 words
8-40% by weight of Nb2O5 and/or Ta2O5, said amount being sufficient to stabilize The glass against crystalization without intensifying the yellowish coloring of the glass
Claim 12
Dependent Claim
13 words
Optical flint glass in accordance with claim 2 in which (3) is Nb2O5.
Claim 13
Dependent Claim
79 words
C-40% BY WEIGHT OF NB2O5 AND/OR TA2O5, SAID AMOUNT BEING SUFFICIENT TO SATBILIZE THR GLASS AGAINST CRYSTALIZATION WITHOUT INTENSIFYING THE YELLOWISH COLORING OF THE GLASS 4. 15-41% BY WEIGHT OF TIO2 5.0-35% BY WEIGHT OF PBO AND 6. 0-6% BY WEIGHT OF AT LEAST ONE OXIDE OF THE GROUP CONSISTING OF WO3, AS2O3 AND BI2O3 THE MAXIMUM CONTENT OF TIO2+PBO AMOUNTING TO NOT MORE THAN 52% BY WEIGHT AND THE CONTENT OF TIO2+OBO+NB2O5+ TA2O5 AMOUNTING TO 35-70% BY WEIGHT.
Claim 14
Dependent Claim
79 words
C-40% BY WEIGHT OF NB2O5 AND/OR TA2O5, SAID AMOUNT BEING SUFFICIENT TO SATBILIZE THR GLASS AGAINST CRYSTALIZATION WITHOUT INTENSIFYING THE YELLOWISH COLORING OF THE GLASS 4. 15-41% BY WEIGHT OF TIO2 5.0-35% BY WEIGHT OF PBO AND 6. 0-6% BY WEIGHT OF AT LEAST ONE OXIDE OF THE GROUP CONSISTING OF WO3, AS2O3 AND BI2O3 THE MAXIMUM CONTENT OF TIO2+PBO AMOUNTING TO NOT MORE THAN 52% BY WEIGHT AND THE CONTENT OF TIO2+OBO+NB2O5+ TA2O5 AMOUNTING TO 35-70% BY WEIGHT.
Claim 15
Dependent Claim
13 words
Optical flint glass in accordance with claim 1 in which (2) is Na2O.
Claim 16
Dependent Claim
5 words
15-41% by weight of TiO2
Claim 17
Dependent Claim
5 words
15-41% by weight of TiO2
Claim 18
Dependent Claim
40 words
0-6% by weight of at least one oxide of the group consisting of WO3, AS2O3 and Bi2O3 the maximum content of TiO2+PbO amounting to not more than 52% by weight and the content of TiO2+PbO+Nb2O5+Ta2O5 amounting to 35-70% by weight.
Claim 19
Dependent Claim
40 words
0-6% by weight of at least one oxide of the group consisting of WO3, AS2O3 and Bi2O3 the maximum content of TiO2+PbO amounting to not more than 52% by weight and the content of TiO2+PbO+Nb2O5+Ta2O5 amounting to 35-70% by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |