Patent US2928381A successfully refreshed from Google Patents.
US2928381A
Expired / Lapsed
US
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Circle drive mechanism
Assignee: Dominion Road Machinery Co Ltd
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Filing: 1956-05-31
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Granted: 1960-03-15
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Expires: 1976-05-31
Abstract
No abstract record available.
Inventors
- 👤 John G Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:56
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7636; E02F3/764; E02F3/7622; E02F3/7627; E02F3/7663; E02F3/7668; E02F3/80; E02F3/84; E02F3/844; E02F9/00; E02F9/08; E02F9/10; E02F9/12; E02F9/121; E02F9/123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |