US3608024A
Expired / Lapsed
US
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Method for producing crimped conjugated split fiber
Assignee: Polymer Processing Research Institute Ltd
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Filing: 1968-02-07
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Granted: 1971-09-21
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Expires: 1988-02-07
Abstract
Abstract Method for producing crimped conjugated split fibers which comprises stretching simultaneously two kinds of films or tapes having mutual affinity but different heat-induced shrinkage which are stretchable with approximately the same stretch ratio in piled state whereby said two kinds of films or tapes are mutually adhered to form an integrally conjugated stretched film, splitting the resultant integrally conjugated stretched film into conjugated split fibers having potential shrinkage and developing crimps upon the goods made of said split fibers by heating under tensionless state.
Inventors
- 👤 Masahide Yazawa
- 👤 Yoshiaki Murono
- 👤 Kazuhiko Kurihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:14
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/423; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
22 words
A method according to claim 1 wherein the two kinds of films range from tapes of narrow width to much wider films.
Claim 2
Dependent Claim
32 words
A method according to claim 1 wherein one of the two kinds of films is a homopolymer and the other of the two kinds of films is a copolymer of said homopolymer.
Claim 3
Dependent Claim
34 words
A method according to claim 1 wherein each of the two kinds of films is made of copolymers of said group, but the amounts of the principal monomer in the two copolymers are different.
Claim 4
Dependent Claim
29 words
A method according to claim 1 wherein each of the two kinds of films are made of the same polymer, but differ from each other in crystalline polymer content.
Claim 5
Dependent Claim
32 words
A method according to claim 1 wherein two kinds of films are made of the same polymer, but have different molecular orientation due to the difference of the condition for film preparation.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |