Patent US3100714A successfully refreshed from Google Patents.
US3100714A
Expired / Lapsed
US
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Optical crown glasses
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1961-10-03
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Granted: 1963-08-13
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Expires: 1981-10-03
Abstract
No abstract record available.
Inventors
- 👤 Bromer Heinz
- 👤 Meinert Norbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:50
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/066; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
OPTICAL GLASS HAVING AN INDEX OF REFRACTION NE ABOVE 1.61 AND AN ABBE NUMBER VE ABOVE 48.2 AND CONSISTING ESSENTIALLY OF, (1) 35 TO 47 PERCENT BY WEIGHT OF SILICA, BORIC OXIDE AND PHOSPHORIC OXIDE OF WHICH THE SILICA CONTENT LIES BETWEEN 5.5 AND 20 PERCENT BY WEIGHT, THE BORIC OXIDE BETWEEN 10.0 AND 31.5 PERCENT BY WEIGHT AND THE PHOSPHORIC OXIDE BETWEEN 10 AND 16 PERCENT BY WEIGHT AND (2) THE BALANCE OF 65 TO 53 PERCENT CONSISTS ESSENTIALLY OF OXIDES SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE, CALCIUM OXIDE, STRONTIUM OXIDE AND BARIUM OXIDE OF WHICH BALANCE CALCIUM OXIDE IS PRESENT IN AMOUNT EQUAL TO AT LEAST 5 PERCENT BY WEIGHT OF THE GLASS COMPOSITION AND BARIUM OXIDE IS PRESENT IN AMOUNT EQUAL TO AT LEAST 20 PERCENT BY WEIGHT OF THE GLASS COMPOSITION.
Claim 2
Dependent Claim
137 words
OPTICAL GLASS HAVING AN INDEX OF REFRACTION NE ABOVE 1.61 AND AN ABBE NUMBER VE ABOVE 48.2 AND CONSISTING ESSENTIALLY OF, (1) 35 TO 47 PERCENT BY WEIGHT OF SILICA, BORIC OXIDE AND PHOSPHORIC OXIDE OF WHICH THE SILICA CONTENT LIES BETWEEN 5.5 AND 20 PERCENT BY WEIGHT, THE BORIC OXIDE BETWEEN 10.0 AND 31.5 PERCENT BY WEIGHT AND THE PHOSPHORIC OXIDE BETWEEN 10 AND 16 PERCENT BY WEIGHT AND (2) THE BALANCE OF 65 TO 53 PERCENT CONSISTS ESSENTIALLY OF OXIDES SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE, CALCIUM OXIDE, STRONTIUM OXIDE AND BARIUM OXIDE OF WHICH BALANCE CALCIUM OXIDE IS PRESENT IN AMOUNT EQUAL TO AT LEAST 5 PERCENT BY WEIGHT OF THE GLASS COMPOSITION AND BARIUM OXIDE IS PRESENT IN AMOUNT EQUAL TO AT LEAST 20 PERCENT BY WEIGHT OF THE GLASS COMPOSITION.
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) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |