US3563773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1969-05-29
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Granted: 1971-02-16
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Expires: 1989-05-29
Abstract
Abstract AN OPTICAL GLASS IS DISCLOSED WHICH CONSISTS ESSENTIALLY OF (A) A GLASS BASE CONSISTING OF B2O3, LA2O3 AND SIO2, (B) OF ZRO2 AND TA2O5, AND (C) OF AT LEAST ONE CONSTITUENT SELECTED FROMA GROUP INCLUDING THE OXIDES AND FLUORIDES RESPECTIVELY OF SUCH METALS AS MAGNESIUM, CALCIUM, BARIUM, ZINC, LEAD, ALUMINUM, YTTRIUM, TITANIUM, NIOBIUM, AND TUNGSTEN. THE INDEX OF REFRACTION OF THE INVENTED GLASS RANGES IN DEPENDENCE ON THE PERCENTAGE OF THE INDIVIDUAL COMPONENTS FROM 1.80 TO 1.92 WHILE THE ABBE NUMBERS ARE BETWEEN 48 AND 35.0.
Inventors
- 👤 Heinz Bromer
- 👤 Norbert Meinert
- 👤 Ernst Leitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:38
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C03C3/064; C03C3/068; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |