US3732189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making polyimides and products produced thereby
Assignee: General Electric Co
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Filing: 1970-03-27
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Granted: 1973-05-08
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Expires: 1990-03-27
Abstract
Abstract A METHOD FOR MAKING POLYIMIDE POLYMERS IS PROVIDED BY EFFECTING REACTION BETWEEN AN ALIPHATICALLY UNSATURATED ANHYDRIDE, SUCH AS MALEIC ANHYDRIDE, AND AN ARYL DIAMINE, FOR EXAMPLE 4,4''-DIAMINODIPHENYLMETHANE IN THE PRESENCE OF CERTAIN ACIDIC CATALYSTS, SUCH AS AN ORGANIC CARBOXYLIC ACID. THE POLYIMIDES PRODUCED BY THE SUBJECT METHOD EXHIBIT SUPERIORHEAT RESISTANCE, AND ARE USEFUL AS MOLDING COMPOUNDS, LAMINATING RESINS, ETC.
Inventors
- 👤 J Crivello
- 👤 A Seidenspinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:12
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121; B32B5/02; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046
Claims Analysis
Total Claims: 0
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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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |