US3017751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentration of aqueous solutions
Assignee: Phillips Petroleum Co
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Filing: 1960-04-25
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Granted: 1962-01-23
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Expires: 1980-04-25
Abstract
No abstract record available.
Inventors
- 👤 Harold M Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:28
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
A PROCESS FOR CONCENTRATING AN AQUEOUS SOLUTION WHICH COMPRISES PASSING A STREAM OF SAID SOLUTION TO A FREEZE ZONE; PASSING A STREAM OF LIQUID REFRIGERANT INTO THE LOWER PORTION OF SAID FREEZE ZONE; MAINTAINING THE PRESSURE IN SAID FREEZE ZONE ABOUT 3 TO 10 P.S.I.A. BELOW THE VAPOR PRESSURE OF THE REFRIGERANT AT 32*F.; WITHDRAWING A SLURRY OF ICE CRYSTALS IN CONCENTRATED SOLUTION FROM SAID FREEZE ZONE; PASSING SAID SLURRY TO THE LOWER PORTION OF A PURIFICATION ZONE; PASSING SAID SLURRY UPWARDLY THROUGH SAID PURIFICATION ZONE; MAINTAINING A PULSATING PRESSURE IN SAID PURIFICATION ZONE ABOUT 3 TO 10 P.S.I.A. ABOVE THE VAPOR PRESSURE OF THE REFRIGERANT AT 32*F.; SEPARATING AND WITHDRAWING CONCENTRATED SOLUTION FROM SAID SLURRY IN SAID PURIFICATION ZONE; WITHDRAWING VA-
References Cited (Backward Citations)
US2821304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-22 | 1965-07-24 | 1966-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-22 | 1969-07-24 | 1970-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-22 | 1973-07-24 | 1974-01-23 | $7700.00 | Window Closed / Lapsed |