Patent US4062933A successfully refreshed from Google Patents.
US2650480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-temperature absorption refrigeration
Assignee: Phillips Petroleum Co
•
Filing: 1947-08-22
•
Granted: 1953-09-01
•
Expires: 1967-08-22
Abstract
No abstract record available.
Inventors
- 👤 Forrest E Gilmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:28
CPC Classifications
F; F25; F25B; F25B15/00; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD OF REFRIGERATION WHICH COMPRISES, SUBJECTING A STREAM OF LIQUEFIED AMMONIA IN SEVERAL SUCCESSIVE STAGES TO A PRESSURE DROP TO FLASH A PORTION THEREOF AT EACH STAGE INTO GASEOUS AMMONIA TO COOL THE LIQUID AMMONIA REMAINING AT EACH STAGE AND PROGRESSIVELY ABSORBING THE AMMONIA VAPORS THUS GENERATED WITH A STREAM OF AQUA AMMONIA IN STAGES OF INCREASING CONCENTRATION AND PRESSURE, WHEREBY THE LIQUID AMMONIA REMAINING IN THE FINAL STAGE IS COOLED TO A DESIRED TEMPERATURE AND REMOVING THE HEAT OF ABSORPTION FROM THE AQUA AMMONIA STREAM PRIOR TO EACH ABSORPTION STEP.
Claim 2
Independent Claim
92 words
A METHOD OF REFRIGERATION WHICH COMPRISES, SUBJECTING A STREAM OF LIQUEFIED AMMONIA IN SEVERAL SUCCESSIVE STAGES TO A PRESSURE DROP TO FLASH A PORTION THEREOF AT EACH STAGE INTO GASEOUS AMMONIA TO COOL THE LIQUID AMMONIA REMAINING AT EACH STAGE AND PROGRESSIVELY ABSORBING THE AMMONIA VAPORS THUS GENERATED WITH A STREAM OF AQUA AMMONIA IN STAGES OF INCREASING CONCENTRATION AND PRESSURE, WHEREBY THE LIQUID AMMONIA REMAINING IN THE FINAL STAGE IS COOLED TO A DESIRED TEMPERATURE AND REMOVING THE HEAT OF ABSORPTION FROM THE AQUA AMMONIA STREAM PRIOR TO EACH ABSORPTION STEP.
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) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |