Patent US2784728A successfully refreshed from Google Patents.
US2784728A
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Valve control system for hydraulic dynamometers, brakes, and couplings
Assignee: Heenan and Froude Ltd
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Filing: 1953-12-23
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Granted: 1957-03-12
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Expires: 1973-12-23
Abstract
No abstract record available.
Inventors
- 👤 William N Bathurst
- 👤 Ivor M Jarvis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:58
CPC Classifications
F; F16; F16D; F16D57/00; F16D57/02; F15; F15B; F15B21/00; F16D33/00; F16D33/06; F16D33/16; Y; Y10; Y10T; Y10T137/00; Y10T137/0971
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1042616A
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GB466436A
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US2116992A
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US2162541A
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US2392262A
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US2421056A
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US2652853A
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US2450199A
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US2634830A
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US2534974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |