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Patent US2787171A successfully refreshed from Google Patents.
US2787171A
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Vehicle propulsion mechanism
Assignee: Joy Manufacturing Co
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Filing: 1951-04-17
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Granted: 1957-04-02
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Expires: 1971-04-17
Abstract
No abstract record available.
Inventors
- 👤 Harold F Silver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:25
CPC Classifications
E; E21; E21C; E21C29/00; E21C29/22; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/19074; Y10T74/19079; Y10T74/19084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1409994A
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US1880666A
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US1968419A
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US2064262A
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US2099044A
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US2074319A
Cited
US2357724A
Cited
US2384182A
Cited
US2585790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |