Patent US2633973A successfully refreshed from Google Patents.
US2633973A
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Underground loading machine
Assignee: Jeffrey Manufacturing Co
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Filing: 1949-09-15
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Granted: 1953-04-07
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Expires: 1969-09-15
Abstract
No abstract record available.
Inventors
- 👤 Sterling C Moon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:36
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/12; E21D9/126; E21D9/128
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US721571A
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US1128880A
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US1728283A
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US1937925A
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US1920500A
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US2066383A
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US2205013A
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US2166447A
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US2386619A
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US2420085A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |