US2051727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preformed media for biological oxidation
Assignee: STATE OF IOWA FOR IOWA STATE C
•
Filing: 1935-10-21
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Granted: 1936-08-18
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Expires: 1955-10-21
Abstract
No abstract record available.
Inventors
- 👤 Levine Max
- 👤 William E Galligan
- 👤 Ralph H Luebbers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:43
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; Y; Y02; Y02W; Y02W10/00; Y02W10/10
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) | 1939-08-18 | 1940-02-17 | 1940-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-08-18 | 1944-02-17 | 1944-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-08-18 | 1948-02-17 | 1948-08-18 | $7700.00 | Window Closed / Lapsed |