Patent US4218647A successfully refreshed from Google Patents.
US2836299A
Expired / Lapsed
US
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Gravel separator and scrubber
Assignee: Individual
•
Filing: 1955-05-16
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Granted: 1958-05-27
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Expires: 1975-05-16
Abstract
No abstract record available.
Inventors
- 👤 Johnson Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:45
CPC Classifications
B; B28; B28C; B28C1/00; B28C1/10; B28C1/14; B28C1/20; B28C1/203; B28C1/206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US211893A
Cited
GB189615727A
Cited
US1942238A
Cited
US2131260A
Cited
US2174836A
Cited
US2249109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |