Patent US3787364A successfully refreshed from Google Patents.
US3787364A
Expired / Lapsed
US
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Process for making polyetherimides
Assignee: General Electric Co
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Filing: 1971-09-01
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Granted: 1974-01-22
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Expires: 1991-09-01
Abstract
Abstract POLYETHERIMIDES ARE PREPARED FROM TH HE REACTION OF A BIS(CHLOROPHTHALIMIDE) WITH AN ALKALI METAL SALT OF A DIVALENT CARBOXYCLIC AROMATIC RADICAL IN THE PRESENCE OF AN APPROPRIATE SOLVENT.
Inventors
- 👤 J Wirth
- 👤 D Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:17
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/1053; C08G65/00; C08G65/34
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 |