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Patent US2053266A successfully refreshed from Google Patents.
US2053266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of calcium phosphates
Assignee: Tennessee Valley Authority
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Filing: 1934-05-21
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Granted: 1936-09-08
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Expires: 1954-05-21
Abstract
No abstract record available.
Inventors
- 👤 Harry A Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:21
CPC Classifications
C; C05; C05B; C05B1/00; C05B1/04
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) | 1939-09-08 | 1940-03-09 | 1940-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-09-08 | 1944-03-09 | 1944-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-09-08 | 1948-03-09 | 1948-09-08 | $7700.00 | Window Closed / Lapsed |