Patent US2273872A successfully refreshed from Google Patents.
US2273872A
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Double silicates of zirconium and method of making same
Assignee: Tam Ceramics LLC
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Filing: 1937-12-29
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Granted: 1942-02-24
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Expires: 1957-12-29
Abstract
No abstract record available.
Inventors
- 👤 Charles J Kinzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:00
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/481; C01; C01G; C01G25/00; C01G25/02; C03; C03C; C03C1/00; C03C1/04; C01P; C01P2006/00; C01P2006/60; C01P2006/80
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) | 1945-02-23 | 1945-08-25 | 1946-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-23 | 1949-08-25 | 1950-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-23 | 1953-08-25 | 1954-02-24 | $7700.00 | Window Closed / Lapsed |