Patent US2689891A successfully refreshed from Google Patents.
US2689891A
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US
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Sprocket drive wheel
Assignee: CONVEYOR ENGINEERING Co
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Filing: 1950-06-21
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Granted: 1954-09-21
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Expires: 1970-06-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Silver
- 👤 Ned M Harrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:18
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/30
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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |