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US3798041A
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US
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Optical glass having anomalous dispersion properties
Assignee: Hoya Glass Works Ltd
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Filing: 1972-07-24
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Granted: 1974-03-19
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Expires: 1992-07-24
Abstract
Abstract An optical glass having an anomalous dispersion property in the short wavelength region, a high Abbe number of greater than 52, a high stability of devitrification and an excellent acid resistance and consisting of. P2O5 44.0 to 68.0%, B2O3 5.0 to 21.0%, Al2O3 1.0 to 8.0%, BaO 4.0 to 33.0%, MgO 1.0 to 14.5%, ZnO 0 to 10.5%, SrO 0 to 12.0%, CaO 0 to 7.0%, La2O3 0 to 9.0%, ThO2 0 to 7.0%, TiO2 0.5 to 4.2% and As2O3 0 to 3.5%, by weight is disclosed.
Inventors
- 👤 T Izumitani
- 👤 I Masuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:03
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/19; C03C3/21; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903; Y10S501/906
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
The anomalous dispersion optical glass of claim 1, wherein said glass consists of, by weight, P2O5 46.0 to 60.0%, B2O3 5.0 to 15.0%, Al2O3 2.0 to 5.0%, Ba O 7.0 to 25.0%, MgO 5.0 to 12.0%, ZnO 0 to 10.0%, SrO 0 to 6.0%, CaO 0 to 6.0%, La2O3 + ThO2 2.0 to 7.0%, TiO2 1.0 to 3.0% and As2O3 0 to 2.0%.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |