US3081178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical borate glass
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1959-08-10
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Granted: 1963-03-12
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Expires: 1979-08-10
Abstract
No abstract record available.
Inventors
- 👤 Weissenberg Gustav
- 👤 Ungemach Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:25
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/15; C03C3/155; C03C3/04; C03C3/062; C03C3/064; C03C3/068; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
OPTICAL GLASS HAVING AN INDEX OF REFRACTION (NE) ABOVE 1.7 AND AN ABBE'' NUMBER ABOVE 47 AND CONSISTING ESSENTIALLY OF (1) AT LEAST 80% BY WEIGHT OF A MIXTURE BORIC OXIDE, LANTHANUM OXIDE AND AT LEAST ONE OXIDE OF THE GROUP OF ALKALINE EARTH METALS CONSISTING OF MAGNESIUM, CALCIUM, STRONTIUM AND BARIUM, IN WHICH THE MOL RATIO OF THE ALKALINE EARTH METAL OXIDE TO THE BORIC OXIDE IS BETWEEN 0.2 AND 1 AND THE MOL RATIO OF THE LANTHANIUM OXIDE TO THE BORIC OXIDE IS BETWEEN 0.148 AND 0.5; P(2) OF 0 TO 20% BY WEIGHT OF AT LEAST ONE OXIDE OF THE ELEMENTS CONSISTING OF GEMANIUM, TIN, ZICONIUM AND TANTALUM; (3) OF 0 TO 5% BY WEIGHT OF THE GROUP CONSISTING OF SILICA AND ALUMINIUM OXIDE,
Claim 2
Dependent Claim
127 words
OPTICAL GLASS HAVING AN INDEX OF REFRACTION (NE) ABOVE 1.7 AND AN ABBE'' NUMBER ABOVE 47 AND CONSISTING ESSENTIALLY OF (1) AT LEAST 80% BY WEIGHT OF A MIXTURE BORIC OXIDE, LANTHANUM OXIDE AND AT LEAST ONE OXIDE OF THE GROUP OF ALKALINE EARTH METALS CONSISTING OF MAGNESIUM, CALCIUM, STRONTIUM AND BARIUM, IN WHICH THE MOL RATIO OF THE ALKALINE EARTH METAL OXIDE TO THE BORIC OXIDE IS BETWEEN 0.2 AND 1 AND THE MOL RATIO OF THE LANTHANIUM OXIDE TO THE BORIC OXIDE IS BETWEEN 0.148 AND 0.5; P(2) OF 0 TO 20% BY WEIGHT OF AT LEAST ONE OXIDE OF THE ELEMENTS CONSISTING OF GEMANIUM, TIN, ZICONIUM AND TANTALUM; (3) OF 0 TO 5% BY WEIGHT OF THE GROUP CONSISTING OF SILICA AND ALUMINIUM OXIDE,
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) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |