US2033913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing thiotetraphosphates and product thereof
Assignee: RUMFORD CHEMICAL WORKS
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Filing: 1934-12-07
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Granted: 1936-03-17
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Expires: 1954-12-07
Abstract
No abstract record available.
Inventors
- 👤 Augustus H Fiske
- 👤 Charles S Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:56
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/083; C01; C01B; C01B25/00; C01B25/16
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) | 1939-03-17 | 1939-09-16 | 1940-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-03-17 | 1943-09-16 | 1944-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-03-17 | 1947-09-16 | 1948-03-17 | $7700.00 | Window Closed / Lapsed |