US3452871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wood product for water and sewage treatment
Assignee: CLYDE B MITCHELL
•
Filing: 1967-04-10
•
Granted: 1969-07-01
•
Expires: 1987-04-10
Abstract
No abstract record available.
Inventors
- 👤 Carl E Hoover
- 👤 Otis E Finley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:15
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/10; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S261/00; Y10S261/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1131740A
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US2037268A
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US2366025A
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US2544733A
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US2955064A
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US3049436A
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US3168411A
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US3231490A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |