US3392039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithium silicate composition
Assignee: PHILADELPHIA QUARTZ Co OF
•
Filing: 1964-12-17
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Granted: 1968-07-09
•
Expires: 1984-12-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank L Cuneo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:01
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2668149A
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US2765237A
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US2933371A
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US2921863A
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US3130061A
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US3180747A
Cited
US3180746A
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US3214287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |