Patent US3327488A successfully refreshed from Google Patents.
US3327488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system for gas liquefaction
Assignee: Air Products and Chemicals Inc
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Filing: 1964-04-17
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Granted: 1967-06-27
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Expires: 1984-04-17
Abstract
No abstract record available.
Inventors
- 👤 James W Pervier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:29
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04284; F25J3/04309; F25J3/04375; F25J3/04393; F25J3/04406; F25J3/04412
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
215 words
PROCESS FOR PRODUCING REFRIGERATION COMPRISING THE STEPS OF PASSING A FIRST STREAM OF COMPRESSED COLD GAS AT A FIRST RELATIVELY HIGH PRESSURE IN HEAT INTERCHANGE WITH A FIRST RELATIVELY WARM FLUID TO WARM THE FIRST STREAM OF COMPRESSED GAS TO A RELATIVELY HIGH TEMPERATURE, EXPANDING THE WARM FIRST STREAM OF COMPRESSED GAS AT THE RELATIVELY HIGH TEMPERATURE AND UNDER THE FIRST RELATIVELY HIGH PRESSURE WITH PRODUCTION OF EXTERNAL WORK TO PRODUCE FIRST EFFLUENT UNDER A FIRST RELATIVELY LOW PRESSURE, PASSING A SECOND STREAM OF COMPRESSED COLD GAS AT SUBSTANTIALLY THE FIRST RELATIVELY HIGH PRESSURE IN COUNTERCURRENT HEAT EXCHANGE WITH FIRST EFFLUENT TO COOL THE FIRST EFFLUENT AND TO WARM THE SECOND STREAM OF COMPRESSED GAS TO TEMPERATURE LOWER THAN THE RELATIVELY HIGH TEMPERATURE OF THE WARM FIRST STREAM OF COMPRESSED GAS, EXPANDING THE WARM SECOND STREAM OF COMPRESSED GAS WITH PRODUCTION OF EXTERNAL WORK TO PRODUCE SECOND EFFLUENT AT A TEMPERATURE LOWER THAN THE TEMPERATURE OF THE FIRST EFFLUENT AND UNDER A PRESSURE CORRESPONDING TO THE FIRST RELATIVELY LOW PRESSURE OF THE FIRST EFFLUENT, THE FIRST EFFLUENT BEING COOLED TO A TEMPERATURE APPROACHING THE TEMPERATURE OF THE SECOND EFFLUENT BY THE HEAT INTERCHANGE WITH THE SECOND STREAM OF COMPRESSED GAS, AND PASSING THE COOLED FIRST EFFLUENT AND THE SECOND EFFLUENT TO A COMMON UTILIZATION ZONE.
Claim 2
Dependent Claim
215 words
PROCESS FOR PRODUCING REFRIGERATION COMPRISING THE STEPS OF PASSING A FIRST STREAM OF COMPRESSED COLD GAS AT A FIRST RELATIVELY HIGH PRESSURE IN HEAT INTERCHANGE WITH A FIRST RELATIVELY WARM FLUID TO WARM THE FIRST STREAM OF COMPRESSED GAS TO A RELATIVELY HIGH TEMPERATURE, EXPANDING THE WARM FIRST STREAM OF COMPRESSED GAS AT THE RELATIVELY HIGH TEMPERATURE AND UNDER THE FIRST RELATIVELY HIGH PRESSURE WITH PRODUCTION OF EXTERNAL WORK TO PRODUCE FIRST EFFLUENT UNDER A FIRST RELATIVELY LOW PRESSURE, PASSING A SECOND STREAM OF COMPRESSED COLD GAS AT SUBSTANTIALLY THE FIRST RELATIVELY HIGH PRESSURE IN COUNTERCURRENT HEAT EXCHANGE WITH FIRST EFFLUENT TO COOL THE FIRST EFFLUENT AND TO WARM THE SECOND STREAM OF COMPRESSED GAS TO TEMPERATURE LOWER THAN THE RELATIVELY HIGH TEMPERATURE OF THE WARM FIRST STREAM OF COMPRESSED GAS, EXPANDING THE WARM SECOND STREAM OF COMPRESSED GAS WITH PRODUCTION OF EXTERNAL WORK TO PRODUCE SECOND EFFLUENT AT A TEMPERATURE LOWER THAN THE TEMPERATURE OF THE FIRST EFFLUENT AND UNDER A PRESSURE CORRESPONDING TO THE FIRST RELATIVELY LOW PRESSURE OF THE FIRST EFFLUENT, THE FIRST EFFLUENT BEING COOLED TO A TEMPERATURE APPROACHING THE TEMPERATURE OF THE SECOND EFFLUENT BY THE HEAT INTERCHANGE WITH THE SECOND STREAM OF COMPRESSED GAS, AND PASSING THE COOLED FIRST EFFLUENT AND THE SECOND EFFLUENT TO A COMMON UTILIZATION ZONE.
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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |