US3809687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of polystyrene
Assignee: Total Petrochemicals and Refining USA Inc
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Filing: 1971-12-20
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Granted: 1974-05-07
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Expires: 1991-12-20
Abstract
Abstract A PROCESS FOR THE HYDROGENATION OF ETHYLENICALLY UNSATURATED AROMATIC POLYMERIC COMPOSITIONS, WHICH PROCESS COMPRISED INTRODUCING SAID POLYMERIC COMPOSITIONS DISPERSED IN A SUITABLE SOLVENT THEREFOR CONCURRENTLY WITTH HYDROGEN INTO A CONTACT WITH A NOBLE METAL CONTAINING CATALYST AT A TEMPERATURE OF 100 TO 350* C. AND AT AN LHSV OF 0.1 TO 10.
Inventors
- 👤 J Moss
- 👤 B Allison
- 👤 C Daniels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:50
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/04
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |