Patent US2613175A successfully refreshed from Google Patents.
US2613175A
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Inhibiting formation of self-propagating polymers during distillation by use of water-soluble nitrites
Assignee: Phillips Petroleum Co
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Filing: 1948-10-18
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Granted: 1952-10-07
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Expires: 1968-10-18
Abstract
No abstract record available.
Inventors
- 👤 Leo H Johnstone
- 👤 Ludwig A Webber
- 👤 John J Costolow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:14
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A CONTINUOUS PROCESS FOR INHIBITING THE FORMATION OF BENZENE INSOLUBLE SELF-PROPAGATING POLYMER IN A BUTADINE FRACTIONATION ZONE IN WHICH A BUTADINE IS BEING FRACTIONATED, WHICH COMPRISING INTRODUCING AN AQUEOUS SOLUTION CONTAINING 1 TO 20 WEIGHT PER CENT OF SODIUM NITRALE INTO AN UPPER PORTION OF SAID BUTADINE FRACTIONATION ZONE AND MAINTAINING SAID AQUEOUS SOLUTION IN THE FRACTIONATION ZONE DURING THE BUTADIENE FRACTIONATION OPERATION, ALLOWING SAID AQUEOUS SOLUTION TO FLOW DOWNWARDLY THROUGH SAID FRACTIONATION ZONE, AND REMOVING SAID AQUEOUS SOLUTION FROM THE BOTTOM PORTION OF SAID FRACTIONATION ZONE.
References Cited (Backward Citations)
US2171795A
Cited
US2240764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |