Patent US2113944A successfully refreshed from Google Patents.
US3027880A
Expired / Lapsed
US
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Quick-acting reversing valve with pressure compensation
Assignee: Shell USA Inc
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Filing: 1960-06-14
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Granted: 1962-04-03
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Expires: 1980-06-14
Abstract
No abstract record available.
Inventors
- 👤 Hendrik K J Van Den Bussche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:02
CPC Classifications
F; F03; F03C; F03C1/00; F03C1/003; F01; F01L; F01L15/00; F01L15/08; F01L25/00; F01L25/02; F01L25/04; F01L25/06; F01L25/063; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86606; Y10T137/8667; Y10T137/86694; Y10T137/8671
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) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |