Patent US2637221A successfully refreshed from Google Patents.
US2637221A
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Change-speed gearing
Assignee: Fuller Manufacturing Co
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Filing: 1949-12-16
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Granted: 1953-05-05
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Expires: 1969-12-16
Abstract
No abstract record available.
Inventors
- 👤 Backus Thomas
- 👤 Elliot L Ludvigsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:19
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/40; F16H63/44; F16H37/00; F16H37/02; F16H37/04; F16H37/042; F16H37/043; F16H63/02; F16H63/30; F16H63/34; F16H63/36; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19167; Y10T74/19219; Y10T74/19242; Y10T74/19247; Y10T74/20; Y10T74/20012; Y10T74/20018; Y10T74/20085; Y10T74/20104; Y10T74/2011
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) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |