US4164530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making monofilament from thermoplastic resin tapes
Assignee: Albany International Corp
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Filing: 1978-03-27
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Granted: 1979-08-14
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Expires: 1998-03-27
Abstract
Abstract Monofilaments are made from films of unoriented, polymeric resin thermoplastics. The method comprises providing strips or tapes of the unoriented films, twisting the tapes into a generally cylindrical cross-section and drawing the twisted tape to obtain an oriented, round-in-cross-section, monofilament. In the preferred embodiment, molding is carried out by drawing down the twisted tape.
Inventors
- 👤 Armen Renjilian
- 👤 Donald S. Nichols
- 👤 Richard J. Hartigan, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:28
CPC Classifications
D; D01; D01D; D01D5/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A method of preparing a monofilament of a thermoplastic polymeric resin, which comprises; providing the thermoplastic polymeric resin in the form of a tape, the molecular structure of the tape being directionally unoriented; twisting the tape to form a generally cylindrical cross-section; heating the twisted tape at or above its glass transition temperature; drawing the twisted tape whereby the pressure of drawing orients the molecular structure of the tape along its lengthwise axis and whereby the twisted tape is fused to form a monofilament with a round cross-section; cooling the fused tape to a temperature below its glass transition temperature.
Claim 2
Independent Claim
100 words
A method of preparing a monofilament of a thermoplastic polymeric resin, which comprises; providing the thermoplastic polymeric resin in the form of a tape, the molecular structure of the tape being directionally unoriented; twisting the tape to form a generally cylindrical cross-section; heating the twisted tape at or above its glass transition temperature; drawing the twisted tape whereby the pressure of drawing orients the molecular structure of the tape along its lengthwise axis and whereby the twisted tape is fused to form a monofilament with a round cross-section; cooling the fused tape to a temperature below its glass transition temperature.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said polymeric resin is poly (ethylene oxide).
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein orienting is carried out by drawing the twisted tape at a 3:1 ratio.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein said tape is a 2-ply tape.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein twisting is at about 14 twists per inch.
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) | 1982-08-13 | 1983-02-12 | 1983-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-13 | 1987-02-12 | 1987-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-13 | 1991-02-12 | 1991-08-14 | $7700.00 | Window Closed / Lapsed |