US3671276A
Expired / Lapsed
US
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Optical fluorophosphate glass having an anomalous partial dispersion ratio
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1969-06-26
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Granted: 1972-06-20
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Expires: 1989-06-26
Abstract
Abstract AN OPTICAL GLASS HAVING AN ANOMALOUS PARTIAL DISPERSION RATIO IS DISCLOSED WHICH IS MELTED FROM A MIXTURE CONSISTING ESSENTIALLY OF ABOUT 58.6-73.8 MOL PERCENT OF THE FLUORIDES OF THE ALKALINE-EARTH METALS: MAGNESIUM, CALCIUM, STRONTIUM AND BARIUM, FURTHER OF ABOUT 5.9-21.8 MOL PERCENT OF THE METAPHOSPHATES OF THE ALKALINE-EARTH METALS: MAGNESIUM, STRONTIUM, CALCIUM, BARIUM AND OF ALUMINUM, ABOUT 6.3-7.6 MOE PERCENT OF MAGNESIUM OXIDE AND OF AT LEAST ONE OF THE FOLLOWING COMPOUNDS: BAT:F6 AND K2TIF6.
Inventors
- 👤 Heinz Bromer
- 👤 Norbert Meinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:51
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/247; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/902; 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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |