Patent US2852870A successfully refreshed from Google Patents.
US2852870A
Expired / Lapsed
US
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Two speed scraper apron
Assignee: Caterpillar Inc
•
Filing: 1955-05-04
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Granted: 1958-09-23
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Expires: 1975-05-04
Abstract
No abstract record available.
Inventors
- 👤 Woodrow P Kimsey
- 👤 William L Holmstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:58
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/46; E02F3/54; E02F3/64; E02F3/6454; E02F3/6481; E02F3/65; E02F3/654; E02F3/656; E02F3/657
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2477811A
Cited
US2508421A
Cited
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 |