Patent US2704778A successfully refreshed from Google Patents.
US2704778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adtio
Assignee: —
•
Filing: —
•
Granted: 1955-03-22
•
Expires: 1972-03-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:43
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/42; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C07C7/10; C07C2603/00; C07C2603/56; C07C2603/58; C07C2603/60; C07C2603/66; C07C2603/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR SEPARATING C5 DIOLEFINS FROM CRACKED DISTILLATES WHICH COMPRISES HEATING A CRACKED PETROLEUM DISTILLATE FRACTION RICH IN ISOPRENE TO A TEMPERATURE IN THE RANGE OF 180* TO 220*F. UNTIL ABOUT 80 TO 90% OF THE CYCLOPENTADIENE PRESENT IN THE FRACTION UNDERGOES DIMERIZATION, SEPARATING THE ISOPRENE FROM THE THUS HEAT-TREATED FRACTION BY DISILLATION AT A TEMPERATURE SUFFICIENTLY LOW TO RETAIN PIPERYLENES WITH CYCLOPENTADIENE DIMER, HEATING THE RESULTING CYCLOPENTADIENE DIMER-PIPERYLENE CONTAINING MIXTURE FREED OF ISOPRENE IN A SECOND THERMAL SOAKING ZONE AT 200 TO 260*F., AND DISTILLING PIPERYLENE MONOMER FROM THE CYCLOPENTADIENE DIMER WHILE MAINTAINING THE CYCLOPENTADIENE DIMER AT TEMPERATURES IN THE RANGE OF 270* TO 310*F.
Claim 2
Dependent Claim
107 words
A PROCESS FOR SEPARATING C5 DIOLEFINS FROM CRACKED DISTILLATES WHICH COMPRISES HEATING A CRACKED PETROLEUM DISTILLATE FRACTION RICH IN ISOPRENE TO A TEMPERATURE IN THE RANGE OF 180* TO 220*F. UNTIL ABOUT 80 TO 90% OF THE CYCLOPENTADIENE PRESENT IN THE FRACTION UNDERGOES DIMERIZATION, SEPARATING THE ISOPRENE FROM THE THUS HEAT-TREATED FRACTION BY DISILLATION AT A TEMPERATURE SUFFICIENTLY LOW TO RETAIN PIPERYLENES WITH CYCLOPENTADIENE DIMER, HEATING THE RESULTING CYCLOPENTADIENE DIMER-PIPERYLENE CONTAINING MIXTURE FREED OF ISOPRENE IN A SECOND THERMAL SOAKING ZONE AT 200 TO 260*F., AND DISTILLING PIPERYLENE MONOMER FROM THE CYCLOPENTADIENE DIMER WHILE MAINTAINING THE CYCLOPENTADIENE DIMER AT TEMPERATURES IN THE RANGE OF 270* TO 310*F.
References Cited (Backward Citations)
US2211038A
Cited
US2397580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-21 | 1958-09-20 | 1959-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-21 | 1962-09-20 | 1963-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-21 | 1966-09-20 | 1967-03-22 | $7700.00 | Window Closed / Lapsed |