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US3399775A
Expired / Lapsed
US
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Sewage treatment apparatus-grit washer-ejector
Assignee: Cpc Engineering Corp
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Filing: 1967-02-01
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Granted: 1968-09-03
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Expires: 1987-02-01
Abstract
No abstract record available.
Inventors
- 👤 Charles P Ciaffone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:01
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/24; B01D21/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US631571A
Cited
GB190921668A
Cited
US1570132A
Cited
US2696462A
Cited
US2874118A
Cited
US3225933A
Cited
US3285420A
Cited
US3298519A
Cited
US3280978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |