Patent US406138A successfully refreshed from Google Patents.
USRE27522E
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for maintaining pressure in refrigeration systems
Assignee: —
•
Filing: 1969-11-12
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Granted: 1972-11-28
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Expires: 1989-11-12
Abstract
Abstract A REFRIGERATION SYSTEM WITH A BYPASS AROUND THE CONDENSER, AND A THREE-WAY BLAVE TO CONTROL REFRIGERANT FLOW TO (OR FROM) THE CONDENSER AND THROUGH THE BYPASS, COMPRISING A UNITARY PRESSURE REGULATED VALVE MEMBER OPERABLE BETWEEN OPPOSITE VALVE PORTS, AND MOVED IN RESPONSE TO PRESSURE UPSTREAM OF THE EXPANSION DEVICE TO THROTTLE FLOW THROUGH THE CONDENSER WHEN THAT PRESSURE IS TOO LOW AND AT THE SAME TIME TO ENLARGE FLOW THROUGH THE BYPASS, WHEN THE PRESSURE IS HIGHER, THE VALVE MODULATES TO REDUCE FLOW THROUGH THE BYPASS AND INCREASE FOW THROUGH THE CONDENSER.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:44
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; F25B49/027; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/044
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |