Patent US3230728A successfully refreshed from Google Patents.
US3230728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge protection for compressors of heat pumps
Assignee: YORK-LUXAIRE Inc A CORP OF DE
•
Filing: 1964-05-12
•
Granted: 1966-01-25
•
Expires: 1984-05-12
Abstract
No abstract record available.
Inventors
- 👤 Gerald L Biehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:57
CPC Classifications
F; F25; F25B; F25B13/00; F25B31/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A HEAT PUMP COMPRISING AN INDOOR AIR COIL, AN OUTDOOR AIR COIL, A REFRIGERANT COMPRESSOR, A TWO-WAY EXPANSION MEANS AND REVERSAL VALVE MEANS CONNECTED IN A CLOSED REFRIGERATION CIRCUIT, SAID VALVE MEANS BEING ADJUSTABLE TO A FIRST POSITION TO ROUTE REFRIGERANT FROM SAID COMPRESSOR TO SAID OUTDOOR COIL FOR OPERATING SAID OUTDOOR COIL AS A CONDENSER, OR TO A SECOND POSITION TO ROUTE REFRIGERANT FROM SAID COMPRESSOR TO SAID INDOOR COIL FOR OPERATING SAID INDOOR COIL AS A CONDENSER, MEANS FOR ADJUSTING SAID VALVE MEANS FROM ONE OF SAID POSITIONS TO THE OTHER ONE OF SAID POSITIONS A NORMALLY OPEN VALVE IN SAID CIRCUIT, MEANS FORMING A THROTTLING PASSAGE CONNECTED ACROSS SAID NORMALLY OPEN VALVE, TIME DELAY MEANS, AND MEANS FOR SUCCESSIVELY CLOSING AND THEN REOPENING SAID NORMALLY OPEN VALVE WHEN SAID REVERSAL VALVE MEANS IS ADJUSTED, SAID LAST MENTIONED MEANS WHEN REOPENING SAID VALVE INCLUDING SAID TIME DELAY MEANS.
Claim 2
Dependent Claim
150 words
A HEAT PUMP COMPRISING AN INDOOR AIR COIL, AN OUTDOOR AIR COIL, A REFRIGERANT COMPRESSOR, A TWO-WAY EXPANSION MEANS AND REVERSAL VALVE MEANS CONNECTED IN A CLOSED REFRIGERATION CIRCUIT, SAID VALVE MEANS BEING ADJUSTABLE TO A FIRST POSITION TO ROUTE REFRIGERANT FROM SAID COMPRESSOR TO SAID OUTDOOR COIL FOR OPERATING SAID OUTDOOR COIL AS A CONDENSER, OR TO A SECOND POSITION TO ROUTE REFRIGERANT FROM SAID COMPRESSOR TO SAID INDOOR COIL FOR OPERATING SAID INDOOR COIL AS A CONDENSER, MEANS FOR ADJUSTING SAID VALVE MEANS FROM ONE OF SAID POSITIONS TO THE OTHER ONE OF SAID POSITIONS A NORMALLY OPEN VALVE IN SAID CIRCUIT, MEANS FORMING A THROTTLING PASSAGE CONNECTED ACROSS SAID NORMALLY OPEN VALVE, TIME DELAY MEANS, AND MEANS FOR SUCCESSIVELY CLOSING AND THEN REOPENING SAID NORMALLY OPEN VALVE WHEN SAID REVERSAL VALVE MEANS IS ADJUSTED, SAID LAST MENTIONED MEANS WHEN REOPENING SAID VALVE INCLUDING SAID TIME DELAY MEANS.
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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |