US4937356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-(3-ethynylphenyl)maleimide
Assignee: National Aeronautics and Space Administration
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Filing: 1989-08-10
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Granted: 1990-06-26
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Expires: 2009-08-10
Abstract
Abstract Acetylene terminated aspartimides are prepared using two methods. In the first, an amino-substituted aromatic acetylene is reacted with an aromatic bismaleimide in a solvent of glacial acetic acid and/or m-cresol. In the second method, an aromatic diamine is reacted with an ethynyl containing maleimide, such as N-(3-ethynylphenyl)maleimide, in a solvent of glacial acetic acid and/or m-cresol. In addition, acetylene terminated aspartimides are blended with various acetylene terminated oligomers and polymers to yield composite materials exhibiting improved mechanical properties.
Inventors
- 👤 Paul M. Hergenrother
- 👤 John W. Connell
- 👤 Stephen J. Havens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0605; C08G73/0611; C08F; C08F299/00; C08F299/02; C08F299/022; C08G73/10; C08G73/1092; C08G73/12; C08G73/121; C08G73/122; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/243; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
1 words
N-(3-ethynylphenyl)maleimide.
Claim 2
Dependent Claim
1 words
N-(3-ethynylphenyl)maleimide.
References Cited (Backward Citations)
US4500719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |