Patent US2568528A successfully refreshed from Google Patents.
US2568528A
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Valve and hydraulic circuit therefor
Assignee: COLONIAL BROACH CO
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Filing: 1944-08-05
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Granted: 1951-09-18
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Expires: 1964-08-05
Abstract
No abstract record available.
Inventors
- 👤 Welte Benedict
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:44
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B13/0417; F15B11/00; F15B11/02; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/3056; F15B2211/30585; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/415; F15B2211/41509; F15B2211/42; F15B2211/421; F15B2211/423; F15B2211/428; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50536; F15B2211/515; F15B2211/5151; F15B2211/52; F15B2211/528; F15B2211/55; F15B2211/60; F15B2211/635; F15B2211/6355; F15B2211/70; F15B2211/71; Y; Y10; Y10S; Y10S74/00; Y10S74/02; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2612; Y10T137/263; Y10T137/2635; Y10T137/8593; Y10T137/87169; Y10T137/87177
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190112925A
Cited
US2102865A
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US2157707A
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US2318851A
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US2263779A
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US2259636A
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US2306382A
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US2354634A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |