Patent US2663453A successfully refreshed from Google Patents.
US2663453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating roof for sewage digesting apparatus
Assignee: Individual
•
Filing: 1950-08-31
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Granted: 1953-12-22
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Expires: 1970-08-31
Abstract
No abstract record available.
Inventors
- 👤 John H Wiggins
- 👤 John W Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:24
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1717100A
Cited
US1919634A
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US2129266A
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US2201652A
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US2202772A
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US2289913A
Cited
US2430592A
Cited
US2497047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |