US3701812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of tricyclopentadiene
Assignee: Monsanto Co
•
Filing: 1970-10-05
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Granted: 1972-10-31
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Expires: 1990-10-05
Abstract
Abstract A PROCESS FOR PREPARING TRICYCLOPENTADIENE FROM A FEED STREAM CONTAINING DICYCLOPENTADIENCE COMPRISING HEATING THE STREAM AT A TEMPERATURE OF FROM 260 TO 310*C. FOR A PERIOD OF FROM 5 TO 25 MINUTES AND UNDER A PRESSURE SUFFICIENT TO MAINTAIN CYCLOPENTADIENE ESSENTIALLY IN SOLUTION. THE PROCESS PRODUCES TRICYCLOPENTADIENE IN YIELDS. GENERALLY ABOVE 70 PERCENT AND SUBSTANTIALLY EXCLUDES PRODCUTION OF CYCLOPENTADIENE POLYMERS HIGHER THAN THE TRIMER.
Inventors
- 👤 Herbert J Gebhart Jr
- 👤 Earle C Makin Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:18
CPC Classifications
C; C07; C07C; C07C13/00; C07C13/28; C07C13/32; C07C13/62; C07C13/64; C07C2/00; C07C2603/00; C07C2603/56; C07C2603/90
Claims Analysis
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |