US3663639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open-chain oligomers and production of the same
Assignee: Mitsubishi Chemical Corp
•
Filing: 1970-03-31
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Granted: 1972-05-16
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Expires: 1990-03-31
Abstract
Abstract OPEN-CHAIN CO-TIMERS OF 1,3-BUTADIENE WITH 1,3-PENTADIENE ARE PRODUCED BY THE CATALYTIC CO-OLIGOMERIZATION OF THE DIENES IN WHICH THE CATALYST IS A MIXTURE OF (I) A PHOSPHORUS COMPOUND OF THE FORMULA PO(OR)3 OR P(OR)3, (II) A TETRAVALENT HALO-, ALKOXY OR ALKOXHALO-TITANIUM COMPOUND OF THE FORMULA TR(OR'')NX4-N, AND (III) ALKYL- OR ALKYLHALO-ALUMINUM COMPOUND OF THE FORMULA AIR"1YM.
Inventors
- 👤 Hiroyuki Morikawa
- 👤 Junji Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:21
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/21; C07C2/00; C07C2/02; C07C2/04; C07C2/38; C07C2/40; C07C2/403; C07C2/406; C07C2527/00; C07C2527/06; C07C2527/135; C07C2531/00; C07C2531/02; C07C2531/12; C07C2531/14; C07C2531/16; C07C2531/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |