US3565832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of aromatic monomers in presence of lewis acid catalyst and oxygen
Assignee: Raytheon Co
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Filing: 1967-09-05
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Granted: 1971-02-23
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Expires: 1987-09-05
Abstract
Abstract THE DISCLOSURE HEREIN CONCERNS A COMMERCIALLY FEASIBLE METHOD OF PREPARING AROMATIC POLYMERS WHICH ARE FUSIBLE AND SOLUBLE IN A VARIETY OF SOLVENTS. THE POLYMERS ARE PREPARED BY HEATING A MIXTURE OF LOW MOLECULAR WEIGHT AROMATIC HYDROCARBONS AND A STRONG LEWIS ACID POLYMERIZATION CATALYST WHILE FORCING GASEOUS OXYGEN INTO THE HEATED REACTION MIXTURE TO FORM RESINS OF A USEFUL COMMERICAIL QUALITY AND CAPABLE OF WITHSTANDING HIGHER TEMPERATURES WITH A NEGLIGIBLE WEIGHT LOSS.
Inventors
- 👤 Norman Bilow
- 👤 John B Rust
- 👤 Abraham L Landis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:19
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/10
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |