Patent US2690A successfully refreshed from Google Patents.
US2736291A
Expired / Lapsed
US
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Piggeries and sewage drainage systems therefor
Assignee: Individual
•
Filing: 1952-12-17
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Granted: 1956-02-28
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Expires: 1972-12-17
Abstract
No abstract record available.
Inventors
- 👤 Duff Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:58
CPC Classifications
A; A01; A01K; A01K1/00; A01K1/015
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US123663A
Cited
DE512080C
Cited
US836386A
Cited
US1394780A
Cited
DE443505C
Cited
DE520329C
Cited
US2603304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |