Patent US2643702A successfully refreshed from Google Patents.
Patent US2796969A successfully refreshed from Google Patents.
US2796969A
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US
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Loading apparatus for tunnel work
Assignee: Joy Manufacturing Co
•
Filing: 1952-08-04
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Granted: 1957-06-25
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Expires: 1972-08-04
Abstract
No abstract record available.
Inventors
- 👤 John D Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:23
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)
DE649990C
Cited
US1476882A
Cited
US989143A
Cited
US1489752A
Cited
US1541393A
Cited
US1627247A
Cited
US1578024A
Cited
US1581435A
Cited
US1677430A
Cited
US1679327A
Cited
DE517708C
Cited
US1875783A
Cited
US1824196A
Cited
US1884671A
Cited
US1920500A
Cited
US2189869A
Cited
US2395716A
Cited
US2500932A
Cited
US2457267A
Cited
US2576217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |