Patent US3761235A successfully refreshed from Google Patents.
US3761235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marble like glass material and method of producing the same
Assignee: Nippon Electric Glass Co Ltd
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Filing: 1971-01-20
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Granted: 1973-09-25
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Expires: 1991-01-20
Abstract
Abstract A MARBLE-LIKE GLASS MATERIAL COMPRISES MORE THAN 90% CALCIUM OXIDE, ALUMINUM OXIDE AND SILICON DIOXIDE, THE MATERIAL INCLUDING 15-40% CAO, 3-35% AL2O3 AND 4075% SIO2.
Inventors
- 👤 T Yamanaka
- 👤 S Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:45
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0036
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |