US4129679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-limbed regenerated cellulose filaments
Assignee: Akzo Nobel UK PLC
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Filing: 1974-10-02
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Granted: 1978-12-12
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Expires: 1994-10-02
Abstract
Abstract Highly absorbent regenerated cellulose filaments have a collapsed hollow structure, a multi-limbed cross-section and a water imbibition of 170 to 345 per cent. They are made by a viscose process using sodium carbonate as an inflating agent.
Inventors
- 👤 Calvin R. Woodings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:45
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; D01D; D01D5/00; D01D5/24; D01D5/253; D01F2/20; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
54 words
A bundle of highly absorbent, regenerated cellulose filaments, substantially all of the filaments of said bundle having a collapsed hollow structure, and at least 60 percent of said filaments comprising in cross-section at least three elongated limbs extending from a common origin, the water imbibition of said bundle being from 170 to 345 percent.
Claim 2
Dependent Claim
54 words
A bundle of highly absorbent, regenerated cellulose filaments, substantially all of the filaments of said bundle having a collapsed hollow structure, and at least 60 percent of said filaments comprising in cross-section at least three elongated limbs extending from a common origin, the water imbibition of said bundle being from 170 to 345 percent.
Claim 3
Dependent Claim
25 words
A bundle of regenerated cellulose filaments as claimed in claim 1 in which the filaments have a count in the range 0.5 to 10 d.Tex.
References Cited (Backward Citations)
US2492425A
Cited
US2835551A
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GB945306A
Cited
US3156605A
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US3626045A
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US3670069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |