Patent US3574804A successfully refreshed from Google Patents.
US3574804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing filaments from thermoplastic film
Assignee: WR Grace and Co
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Filing: 1966-11-18
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Granted: 1971-04-13
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Expires: 1986-11-18
Abstract
Abstract ACCORDING TO THE INVENTION, SUPERIOR FILAMENTS HAVING BEADED EDGES AND WHICH ARE SUITABLE FOR TWISTING AND WEAVING ARE PREPARED FROM THERMOPLASTIC FILM BY SEVERING THE FILM WITH FLAME AS IT IS SELECTIVELY COOLED WHILE PASSING OVER A COOLED, GROOVED ROLL. ALTERNATELY, THE FILM MAY BE COOLED AND THE FLAME SELECTIVELY APPLIED AS WITH A GAS FLAME FITTED WITH A SLITTED HEAT SHIELD. BY USING A DOUBLE WOUND FILM, TUBULAR FILAMENTS ARE PREPARED WHEN THE FILM IS HEAT SEVERED AND THE EDGES OF TWO OR MORE FILAMENTS FUSE TOGETHER.
Inventors
- 👤 Paul Joonase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:28
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/423
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |