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US2691934A
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US
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Spring device for ground tools
Assignee: Ford Motor Co
•
Filing: 1950-08-03
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Granted: 1954-10-19
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Expires: 1970-08-03
Abstract
No abstract record available.
Inventors
- 👤 Robert L Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:17
CPC Classifications
A; A01; A01C; A01C5/00; A01C5/06; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20558
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US610030A
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US755737A
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US860311A
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US904232A
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US912826A
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US2290245A
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US2369436A
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US2416403A
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US2520345A
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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) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |