US3787358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polyphenylene oxides
Assignee: JSR Corp
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Filing: 1971-11-05
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Granted: 1974-01-22
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Expires: 1991-11-05
Abstract
Abstract A PROCESS FOR PRODUCING POLYPHENYLENE OXIDES WHICH COMPRISES REACTING A 2,6-DISUBSTITUTED PHENOL WITH OXYGEN IN THE PRESENCE OF CUPRIC SULFIDE, AN AMINE, AND A METALLIC SALT, OTHER THAN A CUPROUS SALT, WHICH IS SOLUBLE IN SAID AMINE.
Inventors
- 👤 M Ichikawa
- 👤 A Nishioka
- 👤 S Kawatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:31
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |