US3587731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural refrigerant tray type heat exchanger
Assignee: Phillips Petroleum Co
•
Filing: 1968-07-22
•
Granted: 1971-06-28
•
Expires: 1988-07-22
Abstract
Abstract A CORE TYPE HEAT EXCHANGER COMPRISING A PLURALITY OF PARALLEL, CONTIGUOUS AND SEPARATE PASSAGEWAYS POSITIONED IN AN INSULATED SHELL AND ARRANGED ONE ABOVE THE OTHER WITH THE BOTTOM OF ONE PASSAGEWAY CONSTITUTING THE TOP OF THE PASSAGEWAY IMMEDIATELY BELOW WHEREIN MEANS ARE PROVIDED FOR INTRODUCING REFRIGERANTS AT DIFFERENT TEMPERATURE LEVELS INTO PASSAGEWAYS IN COUNTERCURRENT FLOW RELATIONSHIP WITH RESPECT TO THE PROCESS STREAM BEING COOLED AT LOCI IN THE HEAT EXCHANGER CORRESPONDING TO THE TEMPERATURE LEVEL OF THE INDIVIDUAL REFRIGERANTS.
Inventors
- 👤 George E Hays
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:42
CPC Classifications
F; F25; F25J; F25J5/00; F25J5/002; F25J1/00; F25J1/0002; F25J1/0022; F25J1/003; F25J1/0032; F25J1/004; F25J1/0047; F25J1/0052; F25J1/006; F25J1/008; F25J1/0082; F25J1/0085; F25J1/0087; F25J1/02; F25J1/0203; F25J1/0207; F25J1/0243; F25J1/0279; F25J1/0292; F28; F28D; F28D9/00; F28D9/0062; F28D9/0068; F28D9/0093; F25J2220/00; F25J2220/60; F25J2220/62; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/903
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |