US3723241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding of aromatic polyamide film
Assignee: Celanese Corp
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Filing: 1970-09-23
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Granted: 1973-03-27
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Expires: 1990-09-23
Abstract
Abstract TWO OR MORE STRUCTURES OF WHOLLY AROMATIC POLYAMIDES, EITHER THE SAME OR DIFFERENT, ARE ADHERED OR BONDED TOGETHER AS BY WELDING, BY INSERTING BETWEEN THEM A FILM PREPARED BY THE REACTION OF A 70:30 MIXTURE OF META- AND PARA-PHENYLENE DIAMINE AND ISOPHTHALOYL CHLORIDE, THE FILM CONTAINING ABOUT 5 TO 30 WEIGHT PERCENT OF POLYMER SOLVENT, ADHERENCE ACCOMPLISHED BY APPLYING HEAT AND PRESSURE IN THE RANGE OF ABOUT ROOM TEMPERATURE-600*F. AND 15 TO 500 P.S.I., RESPECTIVELY.
Inventors
- 👤 J Rakus
- 👤 J Penoyer
- 👤 M Kowalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:52
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/34; B32B2309/00; B32B2309/02; B32B2309/12; B32B2377/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31728
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |