US2809155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon distillation process
Assignee: EIDP Inc
•
Filing: 1954-03-17
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Granted: 1957-10-08
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Expires: 1974-03-17
Abstract
No abstract record available.
Inventors
- 👤 Oscar R Buehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:43
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE METHOD OF PREVENTING "POPCORN" POLYMER FORMATION IN A SOLUTION OF CRUDE ETHYLENE IN A NORMALLY LIQUID HYDROCARBON MEDIUM, SAID ETHYLENE BEING CONTAMINATED WITH BUTADIENE AS AN IMPURITY, WHICH COMPRISES MAINTAINING THE SAID SOLUTION UNDER DISTILLATION CONDITIONS, IN THE PRESENCE OF A MIXED SYNERGISTIC INHIBITOR CONSISTING OF PHENYL HYDRAZINE, ISOAMYL NITRITE, AND P-TERTIARY BUTYL CATECHOL, THE QUANTITIES OF EACH INHIBITOR BEING FROM 10 TO 1000 PARTS PER MILLION PARTS BY WEIGHT OF SAID SOLUTION, UNDER PRESSURE OF AT LEAST 260 P.S.I. AT A TEMPERATURE NOT EXCEEDING THE CRITICAL TEMPERATURE ABOVE WHICH "POPCORN" POLYMER FORMS IN THE MIXTURE, SAID CRITICAL TEMPERATURE BEING WITHIN THE RANGE OF 100*C. TO 200*C.
Claim 2
Independent Claim
108 words
THE METHOD OF PREVENTING "POPCORN" POLYMER FORMATION IN A SOLUTION OF CRUDE ETHYLENE IN A NORMALLY LIQUID HYDROCARBON MEDIUM, SAID ETHYLENE BEING CONTAMINATED WITH BUTADIENE AS AN IMPURITY, WHICH COMPRISES MAINTAINING THE SAID SOLUTION UNDER DISTILLATION CONDITIONS, IN THE PRESENCE OF A MIXED SYNERGISTIC INHIBITOR CONSISTING OF PHENYL HYDRAZINE, ISOAMYL NITRITE, AND P-TERTIARY BUTYL CATECHOL, THE QUANTITIES OF EACH INHIBITOR BEING FROM 10 TO 1000 PARTS PER MILLION PARTS BY WEIGHT OF SAID SOLUTION, UNDER PRESSURE OF AT LEAST 260 P.S.I. AT A TEMPERATURE NOT EXCEEDING THE CRITICAL TEMPERATURE ABOVE WHICH "POPCORN" POLYMER FORMS IN THE MIXTURE, SAID CRITICAL TEMPERATURE BEING WITHIN THE RANGE OF 100*C. TO 200*C.
References Cited (Backward Citations)
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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) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |