Patent JPS63254728A successfully refreshed from Google Patents.
US2853201A
Expired / Lapsed
US
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Double-acting hydraulic dirt ejector
Assignee: Caterpillar Global Mining LLC
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Filing: 1953-10-15
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Granted: 1958-09-23
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Expires: 1973-10-15
Abstract
No abstract record available.
Inventors
- 👤 Trevor O Davidson
- 👤 James E Roche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:32
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/40; E02F3/407; E02F3/4075; Y; Y10; Y10S; Y10S37/00; Y10S37/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |