US3526591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment structure
Assignee: FMC Corp
•
Filing: 1969-02-28
•
Granted: 1970-09-01
•
Expires: 1989-02-28
Abstract
No abstract record available.
Inventors
- 👤 Quentin L Hampton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:42
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/10; B01D21/12; B01D21/14; B01D21/24; B01D21/2433; B01D21/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2094552A
Cited
US3396102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-31 | 1974-03-02 | 1974-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-31 | 1978-03-02 | 1978-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-31 | 1982-03-02 | 1982-09-01 | $7700.00 | Window Closed / Lapsed |