US3833546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making polyetherimides
Assignee: General Electric Co
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Filing: 1973-06-22
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Granted: 1974-09-03
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Expires: 1993-06-22
Abstract
Abstract A PROCESS FOR MAKING POLYETHERIMIDES IS PROVIDED BY MELT POLYMERIZING A MIXTURE OF ORGANIC DIAMINES AND CERTAIN AROMATIC BIS(ETHERDICARBONYL) COMPOUNDS SUCH AS AROMATIC TETRA-CARBOXYLIC ACIDS AND DIANHYDRIDES THEREOF. THE POLYETHERIMIDES CAN BE MADE IN A CONTINUOUS MANNER. FILLERS CAN BE INCORPORATED INTO THE POLYETHERIMIDES TO PRODUCE HIGH PERFORMANCE COMPOSITES.
Inventors
- 👤 T Takekoshi
- 👤 J Kochanowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:58
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028; C08G73/1042; C08G73/1046; C08G73/1053; C08G73/1057; C08G73/106
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |