Patent US3664581A successfully refreshed from Google Patents.
US3664581A
Expired / Lapsed
US
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Thermostatically controlled expansion valve for refrigerating equipment
Assignee: Danfoss AS
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Filing: 1971-02-09
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Granted: 1972-05-23
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Expires: 1991-02-09
Abstract
Abstract THE INVENTION RELATES TO A THERMOSTATICALLY CONTROLLED VALVE ASSEMBLY FOR HIGH CAPACITY REFRIGERATION EQUIPMENT. THE VALVING INCLUDES MAIN AND AUXIALIARY VALVES WITH THE AUXILIARY VALVE FUNCTIONING AS A PILOT VALVE. IN THE OPER- ATION THE MAIN VALVE MAY OCCUPY ANY INTERMEDIATE POSITION BETWEEN FULLY OPENED AND FULLY CLOSED POSITIONS.
Inventors
- 👤 Jorgen Christian Stannow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:08
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/363; F25; F25B; F25B41/00; F25B41/30; F25B41/31; F25B41/325; F25B41/33; F25B41/335; F25B41/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |