US1993761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for water purification
Assignee: ACTIVATED ALUM Corp
•
Filing: 1932-09-12
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Granted: 1935-03-12
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Expires: 1952-09-12
Abstract
No abstract record available.
Inventors
- 👤 Benjamin F Tippins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:05
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/283; C02F1/52; C02F1/5236
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) | 1938-03-11 | 1938-09-10 | 1939-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-11 | 1942-09-10 | 1943-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-11 | 1946-09-10 | 1947-03-12 | $7700.00 | Window Closed / Lapsed |