US3703389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass having a high refracting index and a high color dispersion
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1970-08-03
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Granted: 1972-11-21
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Expires: 1990-08-03
Abstract
Abstract AN OPTICAL GLASS OF WHICH THE REFRACTIVE INDEX RANGES BETWEEN NE=1.77 AND NE=1.83, AND OF WHICH THE ABBE NUMBER RANGES BETWEEN VE=26 AND VE=23. THE GLASS CONSISTS ESSENTIALLY OF A GLASS FORMER OF SILICON DIOXIDE AND GERMANIUM DIOXIDE AND IN ADDITION THERETO A RELATIVELY HIGH PERCENTAGE OF TITANIUM DIOXIDE IS ADDED. OTHER INGREDIENTS PRESENT ARE THE OXIDES OF SODIUM AND POTASSIUM AS WELL AS THE OXIDES OF BORON AND LEAD. IN SPITE OF THE HIGH PERCENTAGE OF TITANIUM DIOXIDE THE GLASS IS ONLY FAINTLY COLORED.
Inventors
- 👤 Heinz Bromer
- 👤 Norbert Meinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:34
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901; Y10S501/903
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |