Patent US3703434A successfully refreshed from Google Patents.
US3703434A
Expired / Lapsed
US
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Heat-activatable adhesive sheets
Assignee: 3M Co
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Filing: 1968-03-29
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Granted: 1972-11-21
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Expires: 1988-03-29
Abstract
Abstract A SELF-SUPPORTING HEAT-ACTIVATABLE ADHESIVE SHEET COMPRISING A FILM OF THERMOPLASTIC POLYAMIDE RESIN COATED ON BOTH SIDES WITH A RELATIVELY THIN LAYER OF A SUBSTANTIALLY UNIFORM BLEND OF FUSIBLE EPOXY RESIN AND AMINE. THE ADHESIVE SHEET HAS EXCELLENT SHELF LIFE AT TEMPERATURES UP TO ABOUT 120*F. WHILE BEING CAPABLE OF RAPIDLY FORMING STRONG HEAT-RESISTANT COMPOSITIONS ON BOTH SURFACES OF SAID ADHESIVE SHEET SUBJECTED TO HEAT AND PRESSURE.
Inventors
- 👤 Ronald L Schaaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:33
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2852; Y10T428/287
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |