US3802954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic fibers having excellent pilling resistance and a process for producing the same
Assignee: Mitsubishi Chemical Corp
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Filing: 1971-05-24
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Granted: 1974-04-09
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Expires: 1991-05-24
Abstract
Abstract Acrylic fibers having excellent pilling resistance are disclosed. The acrylic fibers have a plurality of elongated wedge-shaped concave depressions extending into the fiber surface. And the acrylic fibers are produced by pre-treating acrylic fibers with a modifier to modify the outer layer of individual fiber and then after-treating the fibers with an organic solvent for acrylic fiber.
Inventors
- 👤 Z Orito
- 👤 M Uchida
- 👤 K Fujii
- 👤 M Takesue
- 👤 H Sahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:15
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/32; D06M11/36; D06M11/38; D06M11/51; D06M11/55; D06M11/58; D06M11/63; D06M13/00; D06M13/10; D06M13/224; D06M13/232; D06M13/244; D06M13/248; D06M13/268; D06M13/322; D06M13/345; D06Q; D06Q1/00; D06Q1/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/2978; Y10T428/298
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
Acrylic fibers according to claim 1, wherein said concave depressions are rhombic in shape, length (a) of the elongated axis of the individual depression being in the range of 0.5 Mu to 20 Mu and the maximum depth (b) of said depressions being in the range of 0.2 Mu to 10 Mu , the major axis of said rhombic depressions being aligned in the direction of the fiber axis and the minor axis thereof being aligned in the direction perpendicular to the fiber axis.
Claim 2
Dependent Claim
38 words
Acrylic fibers according to claim 1, wherein said fibers contain at least 80 percent by weight of acrylonitrile and the number of said depressions ranges from 5 to 50 per inch along the length of an individual fiber.
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) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |