US2452754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable power transmission
Assignee: Rockford Machine Tool Co
•
Filing: 1944-02-21
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Granted: 1948-11-02
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Expires: 1964-02-21
Abstract
No abstract record available.
Inventors
- 👤 Rudolph E Herrstrum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:46
CPC Classifications
F; F16; F16H; F16H23/00; F01; F01B; F01B3/00; F01B3/0032; F01B3/10; F01B3/103; F01B3/106; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296; Y10T74/18336
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US511044A
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US951278A
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US1263180A
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US1362040A
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US1840866A
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US1822064A
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GB419135A
Cited
US2146117A
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US2272771A
Cited
US2307719A
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US2292125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |