Patent US3611081A successfully refreshed from Google Patents.
US3756908A
Expired / Lapsed
US
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Synthetic paper structures of aromatic polyamides
Assignee: EIDP Inc
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Filing: 1971-02-26
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Granted: 1973-09-04
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Expires: 1991-02-26
Abstract
Abstract NONWOVEN, FLEXIBLE SHEET STRUCTURES OF COMMINGLED FIBRIDS OF A NONFUSIBLE AROMATIC POLYAMIDE AND SHORT AROMATIC POLYAMIDE FIBERS WHEREIN ALL FIBERS HAVE AN INITIAL MODULUS LESS THAN 80 GM./DENIER ARE DISCLOSED HEREIN. THE STRUCTURES HAVE GOOD THERMAL PROPERTIES, GOOD FLEX LIFE AND A HIGH DEGREE OF ELONGATION. THE STRUCTURES CAN BE PREPARED BY CONVENTIONAL PAPER-MAKING PROCEDURES. THE STRUCTURES MAY CONTAIN ADDITIVES TO INHIBIT OXDATION, ETC., AND BINDERS, IF DESIRED.
Inventors
- 👤 G Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:42
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; D; D21; D21H; D21H13/00; D21H13/10; D21H13/20; D21H13/26; B32B5/02; B32B5/022; B32B2262/00; B32B2262/02; B32B2262/0261; B32B2262/0269; B32B2262/0276; B32B2262/0284
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |