US2463814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dewatering apparatus
Assignee: Marathon Corp
•
Filing: 1944-11-07
•
Granted: 1949-03-08
•
Expires: 1964-11-07
Abstract
No abstract record available.
Inventors
- 👤 Harold A Skinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:18
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US326945A
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US479617A
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DE149842C
Cited
US905374A
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US964897A
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US1236072A
Cited
US1480500A
Cited
US1731193A
Cited
DE569662C
Cited
US2286132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-07 | 1952-09-06 | 1953-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-07 | 1956-09-06 | 1957-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-07 | 1960-09-06 | 1961-03-08 | $7700.00 | Window Closed / Lapsed |