US2791333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal purification apparatus and process
Assignee: Phillips Petroleum Co
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Filing: 1953-07-27
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Granted: 1957-05-07
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Expires: 1973-07-27
Abstract
No abstract record available.
Inventors
- 👤 Dwight L Mckay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:10
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
117 words
CRYSTAL PURIFICATION APPARATUS COMPRISING AN ELONGATED, CLOSED COLUMN HAVING A PURIFICATION SECTION AND A MELTING SECTION; MEANS FOR INTRODUCING A FORCED SLURRY OF CRYSTALS INTO THE PURIFICATION SECTION; MEANS FOR MOVING SAID CRYSTALS THROUGH SAID PURIFICATION SECTION TO SAID MELTING SECTION; AN INTERNAL FILTER AXIALLY DISPOSED IN SAID PURIFICATION SECTION AND SPACED APART FROM SAID MELTING SECTION AND FROM THE WALLS OF SAID PURIFICATION SECTION, AFORESAID FILTR BEING ADAPTED TO WITHDRAW LIQUID FORCED COUNTERCURRENTLY TO THE MOVEMENT OF CRYSTALS BY DISPLACEMENT OF MELT IN SAID MELTING SECTION; A TAKE-OFF LINE CONNECTED WITH SAID AXIAL FILTER; A SECOND FILTER UPSTREAM CRYSTALWISE OF SAID AXIAL FILTER HAVING A TAKE-OF LINE FOR WITHDRAWING MOTHER LIQUOR FROM THE COLUMN; A HEATING
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-06 | 1960-11-05 | 1961-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-06 | 1964-11-05 | 1965-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-06 | 1968-11-05 | 1969-05-07 | $7700.00 | Window Closed / Lapsed |