US3798281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of polyarylenes
Assignee: Standard Oil Co
•
Filing: 1972-07-31
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Granted: 1974-03-19
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Expires: 1992-07-31
Abstract
Abstract AN IMPROVED RAPID PROCESS FOR OBTAINING POLYARYLENES, I.E., POLYMERS OF AROMATIC COMPOUNDS BY CONTACTING AROMATIC COMPOUNDS WITH AN AL2O3-SIO2 CATALYST SYSTEM.
Inventors
- 👤 Shen Wang Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:25
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/12; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; C; C08; C08G; C08G61/00; C08G61/02; C08G61/10
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |