Patent US3285025A successfully refreshed from Google Patents.
US3285025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-stage crystallization process
Assignee: Phillips Petroleum Co
•
Filing: 1963-12-20
•
Granted: 1966-11-15
•
Expires: 1983-12-20
Abstract
No abstract record available.
Inventors
- 👤 Duane D Shaul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:07
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0036; B01D9/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A MULTI-STAGE CRYSTALLIZATION PROCESS WHICH COMPRISES PASSING A LIQUID MULTI-COMPONENT MIXTURE TO A FIRST CRYSTALLIZATION ZONE, FORMING A SLURRY COMPRISING MOTHER LIQUOR AND CRYSTALS WITHIN SAID FIRST CRYSTALLIZATION ZONE AND FOLLOWING CRYSTALLIZATION ZONES, THE FINAL CRYSTALLIZATION ZONE COMPRISING A CHILLING ZONE AND A PURIFICATION ZONE, AND SEPARATING SAID MOTHER LIQUOR FROM SAID CRYSTALS IN SAID FIRST AND FOLLOWING CRYSTALLIZATION ZONES, THE LIQUID FEED TO EACH OF SAID FOLLOWING CRYSTALLIZATION ZONES COMPRISING THE MOTHER LIQUOR WITHDRAWN FROM THE ADJACENT UPSTREAM CRYSTALLIZATION ZONE; THE IMPROVEMENT WHICH COMPRISES REFLUXING THE CRYSTALS BY FLOWING A LIQUID COUN-
Claim 2
Dependent Claim
94 words
IN A MULTI-STAGE CRYSTALLIZATION PROCESS WHICH COMPRISES PASSING A LIQUID MULTI-COMPONENT MIXTURE TO A FIRST CRYSTALLIZATION ZONE, FORMING A SLURRY COMPRISING MOTHER LIQUOR AND CRYSTALS WITHIN SAID FIRST CRYSTALLIZATION ZONE AND FOLLOWING CRYSTALLIZATION ZONES, THE FINAL CRYSTALLIZATION ZONE COMPRISING A CHILLING ZONE AND A PURIFICATION ZONE, AND SEPARATING SAID MOTHER LIQUOR FROM SAID CRYSTALS IN SAID FIRST AND FOLLOWING CRYSTALLIZATION ZONES, THE LIQUID FEED TO EACH OF SAID FOLLOWING CRYSTALLIZATION ZONES COMPRISING THE MOTHER LIQUOR WITHDRAWN FROM THE ADJACENT UPSTREAM CRYSTALLIZATION ZONE; THE IMPROVEMENT WHICH COMPRISES REFLUXING THE CRYSTALS BY FLOWING A LIQUID COUN-
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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |