US3576691A
Expired / Lapsed
US
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Method of bonding employing high-temperature polymaleimide adhesives
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1968-04-18
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Granted: 1971-04-27
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Expires: 1988-04-18
Abstract
Abstract THIS INVENTION RELATES TO HIGH-TEMPERATURE ADHESIVE COMPOSITIONS AND TO A METHOD OF PREPARING SAME WHICH COMPRISES LOW MOLECULAR WEIGHT POLYIMIDE PREPOLYMERS OBTAINED BY COREACTING A POLYFUNCTIONAL AMINE, E.G. A DIAMINE, A POLYANHYDRIDE, E.G.A DIANHYDRIDE AND MALEIC ANHYDRIDE, AS THE END-CAPPING OR TERMINAL GROUP. THESE ADHESIVE-FORMING PREPOLYMERS ARE USEFUL FOR BONDING VARIOUS MATERIALS TOGETHER BY APPLYING, FOR EXAMPLE, A FILM OF THE PREPOLYMER ONTO THE SURFACES OF SAID MATERIALS AND BONDING THEM TOGETHER BY APPLYING PRESSURES RANGING FROM ATOMOSPHERIC TO ABOUT 1,000 P.S.I.G. AT TEMPERATURES RANGING FROM ABOUT 175*C. TO 300*C.
Inventors
- 👤 Robert A Meyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:47
CPC Classifications
C; C09; C09J; C09J5/00; C09J5/06; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31616; Y10T428/31678; Y10T428/31681; Y10T428/31721; Y10T428/31826
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |