US3819769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split fibers from blends of polypropylene and polyethylene
Assignee: Bemberg AG
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Filing: 1968-12-26
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Granted: 1974-06-25
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Expires: 1988-12-26
Abstract
Abstract SPLIT FIBERS EXHIBITING THE RETICULAR STRUCTURE OBTAINED BY MECHANICAL REDUCTION OF AN EXTRUDED AND STRETCHED POLYMER FILM STRIP, THE POLYMER CONSISTING ESSENTIALLY OF A MIXTURE OF POLYPROPYLENE HAVING MORE THAN 5% ATACTIC CONTENT WITH A LOW-PRESSURE POLYETHYLENE. THE RESULTING SPLIT FIBERS ARE GENERALLY USEFUL AS CONTINUOUS THREADS, YARNS AND THE LIKE OR AS STAPLE FIBERS.
Inventors
- 👤 E Pirot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:52
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/423; D01F; D01F6/00; D01F6/44; D01F6/46; Y; Y10; Y10S; Y10S264/00; Y10S264/47
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |