US3353367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid refrigerant return system
Assignee: Frick Co Inc
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Filing: 1966-04-11
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Granted: 1967-11-21
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Expires: 1986-04-11
Abstract
No abstract record available.
Inventors
- 👤 Milton W Garland
- 👤 Richard A Peard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:03
CPC Classifications
F; F25; F25B; F25B45/00; F25B41/00; F25B2400/00; F25B2400/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD OF RETURNING LIQUID REFRIGERNANT SEPARATED FROM THE LOW PRESSURE SIDE OF A REFRIGERATING SYSTEM OF THE VOLATILE LIQUID-VAPOR CYCLE TYPE TO THE HIGH PRESSURE SIDES OF SUCH REFRIGERATING SYSTEM COMPRISING THE STEPS OF (A) COLLECTING THE SEPARATED LIQUID REFRIGERANT, (B) PASSING SEPARATED LIQUID REFRIGERANT WHEN A PREDETERMINED AMOUNT IS COLLECTED INTO A RECEIVER, (C) MAINTAINING THE RECEIVER AT A PRESSURE VALUE INTERMEDIATE OF THE PRESSURES OF THE LOW AND HIGH PRESSURE SIDES OF THE REFRIGERATING SYSTEM, AND (D) COMMUNICATING THE RECEIVER WITH THE HIGH PRESSURE SIDE OF THE REFRIGERATING SYSTEM, WHEN THE AMOUNT OF SEPARATED LIQUID REFRIGERANT COLLECTED REACHES A PREDETERMINED MINIMUM AMOUNT SO THAT THE LIQUID REFRIGERANT WILL THEREBY BE TURNED TO THE REFRIGERATING SYSTEM.
Claim 2
Independent Claim
118 words
A METHOD OF RETURNING LIQUID REFRIGERNANT SEPARATED FROM THE LOW PRESSURE SIDE OF A REFRIGERATING SYSTEM OF THE VOLATILE LIQUID-VAPOR CYCLE TYPE TO THE HIGH PRESSURE SIDES OF SUCH REFRIGERATING SYSTEM COMPRISING THE STEPS OF (A) COLLECTING THE SEPARATED LIQUID REFRIGERANT, (B) PASSING SEPARATED LIQUID REFRIGERANT WHEN A PREDETERMINED AMOUNT IS COLLECTED INTO A RECEIVER, (C) MAINTAINING THE RECEIVER AT A PRESSURE VALUE INTERMEDIATE OF THE PRESSURES OF THE LOW AND HIGH PRESSURE SIDES OF THE REFRIGERATING SYSTEM, AND (D) COMMUNICATING THE RECEIVER WITH THE HIGH PRESSURE SIDE OF THE REFRIGERATING SYSTEM, WHEN THE AMOUNT OF SEPARATED LIQUID REFRIGERANT COLLECTED REACHES A PREDETERMINED MINIMUM AMOUNT SO THAT THE LIQUID REFRIGERANT WILL THEREBY BE TURNED TO THE REFRIGERATING SYSTEM.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |