Patent US3740242A successfully refreshed from Google Patents.
US3740242A
Expired / Lapsed
US
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Optical glasses
Assignee: Individual
•
Filing: 1971-03-04
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Granted: 1973-06-19
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Expires: 1991-03-04
Abstract
Abstract THORIUM OXIDE AND BERYLLIUM OXIDE-FREE GLASSES SUITABLE TO CONTINUOUS MELTING AND PRODUCTION HAVING THE FOLLOWING COMPARATIVE VALUES: INDEX OF REFRACTION: ABBE VALUE ND 1.693 VD 53 ND 1.761 VD 41 ND 1.750 VD 37 AND HAVING A COMPOSITION: WEIGHT PERCENT SIO2 18.0-23.1 B2O3 7.6-14.8 SIO2+B2O3 27.0-33.8 BAO 27.1-46.2 LA2O3 3.6-19.2 BAO+LA2O3 30.7-62.9 CDO 0.8-16.1 ZRO2 1.0-3.5 CDO+ZRO2 2.3-19.0
Inventors
- 👤 M Faulstich
- 👤 W Ritze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:46
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/064; C03C3/068; C03C3/074; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 0
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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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |