US3681098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opal glass compositions comprising calcium fluoride
Assignee: Corning Glass Works
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Filing: 1970-01-14
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Granted: 1972-08-01
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Expires: 1990-01-14
Abstract
Abstract THIS INVENTION RELATES TO THE MANUFACTURE OF SPONTANEOUS OPAL GLASSES WHEREIN THE OPACITY THEREIN IS THE RESULT OF AMORPHOUS DROPLETS AND CALCIUM FLUORIDE (CAF2) CRYSTALS, MORE SPECIFICALLY, THIS INVENTION RELATES TO SPONTANEOUS OPAL GLASSES CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, OF ABOUT 50-75% SIO2, 3-14% A12O3, 10-20% CAO, 3-10% R2O, WHEREIN R2O CONSISTS OF 0-7% NA2O AND 0-7% K2O, 0.25-5% M0O3 AND/OR WO3 AND/OR AS2O3 AND 2-5% F.
Inventors
- 👤 William H Dumbaugh Jr
- 👤 James E Flannery
- 👤 George B Hares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:44
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/005; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112; C03C2204/00; C03C2204/04
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |