US3689460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interpolymers of carbon monoxide and process for preparing same
Assignee: Shell USA Inc
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Filing: 1971-03-04
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Granted: 1972-09-05
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Expires: 1991-03-04
Abstract
Abstract HIGH MELTING, CRYSTALLINE INTERPOLYMERS OF CARBON MONOXIDE WITH ONE OR MORE UNSATURATED COMPOUNDS SUCH AS ALIPHATIC MONOOLEFINS PARTICULARLY ETHYLENE, ARE PREPARED BY REACTING CARBON MONIXIDE WITH SAID UNSATURATED COMPOUNDS IN THE PRESENCE OF SELECTED INERT SOLVENTS AND A CATALYTIC AMOUNT OF TETRAKIS(TRIARYL PHOSPHINE) PALLADIUM, PARTICULARLY TETRAKIS(TRIPHENYL PHOSPHINE) PALLADIUM.
Inventors
- 👤 Kenzie Nozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:15
CPC Classifications
C; C08; C08G; C08G67/00; C08G67/02
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |