Patent US4599267A successfully refreshed from Google Patents.
US4599267A
Expired / Lapsed
US
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High strength and modulus polyvinyl alcohol fibers and method of their preparation
Assignee: Honeywell International Inc
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Filing: 1984-01-11
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Granted: 1986-07-08
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Expires: 2004-01-11
Abstract
Abstract Polyvinyl alcohol of molecular weight over 500,000 (i.e. 1,500,000 to 2,500,000) is spun as a dilute solution (2-15%) in a relatively non-volatile solvent such as glycerin. The resultant gel fiber is extracted with a volatile solvent such as methanol and dried. Upon stretching at one or more stages during the process, fibers of tenacity above 10 g/denier and modulus above 200 g/denier (e.g. 18 and 450, respectively) are produced.
Inventors
- 👤 Young D. Kwon
- 👤 Sheldon Kavesh
- 👤 Dusan C. Prevorsek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:55
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
42 words
A polyvinyl alcohol fiber of weight average molecular weight at least about 500,000 and having a tenacity of at least about 10 g/denier, a tensile modulus of at least about 200 g/denier and a melting temperature of at least about 238° C.
Claim 2
Dependent Claim
42 words
A polyvinyl alcohol fiber of weight average molecular weight at least about 500,000 and having a tenacity of at least about 10 g/denier, a tensile modulus of at least about 200 g/denier and a melting temperature of at least about 238° C.
Claim 3
Dependent Claim
17 words
The polyvinyl alcohol fiber of claim 1 having a melting temperature of at least about 245° C.
Claim 4
Dependent Claim
18 words
The polyvinyl alcohol fiber of claim 1 being of weight average molecular weight of at least about 750,000.
Claim 5
Dependent Claim
26 words
The polyvinyl alcohol fiber of claim 1 having a tenacity of at least about 14 g/denier and a tensile modulus of at least about 300 g/denier.
Claim 6
Dependent Claim
32 words
A polyvinyl alcohol fiber of weight average molecular weight at least about 750,000 and having a tenacity of at least about 14 g/denier and a tensile modulus at least about 300 g/denier.
Claim 7
Dependent Claim
32 words
A polyvinyl alcohol fiber of weight average molecular weight at least about 750,000 and having a tenacity of at least about 14 g/denier and a tensile modulus at least about 300 g/denier.
Claim 8
Dependent Claim
26 words
The polyvinyl alcohol fiber of claim 1 having a tenacity of at least about 17 g/denier and a tensile, modulus of at least about 400 g/denier.
Claim 9
Dependent Claim
17 words
The polyvinyl alcohol fiber of claim 6 having a tensile modulus of at least about 550 g/denier.
Claim 10
Dependent Claim
20 words
The polyvinyl alcohol fiber of claim 1 being of weight average molecular weight of between about 1,000,000 and about 4,000,000.
Claim 11
Dependent Claim
19 words
The polyvinyl alcohol fiber of claim 8 being of weight average molecular weight between about 1,500,000 and about 2,500,000.
Claim 12
Dependent Claim
26 words
The polyvinyl alcohol fiber of claim 2 having a tenacity of at least about 17 g/denier and a tensile modulus of at least about 400 g/denier.
Claim 13
Dependent Claim
17 words
The polyvinyl alcohol fiber of claim 10 having a tensile modulus of at least about 550 g/denier.
Claim 14
Dependent Claim
26 words
The polyvinyl alcohol fiber of claim 5 having a tenacity of at least about 17 g/denier and a tensile modulus of at least about 400 g/denier.
Claim 15
Dependent Claim
17 words
The polyvinyl alcohol fiber of claim 12 having a tensile modulus of at least about 550 g/denier.
Claim 16
Dependent Claim
20 words
The polyvinyl alcohol fiber of claim 2 being of weight average molecular weight of between about 1,000,000 and about 4,000,000.
Claim 17
Dependent Claim
19 words
The polyvinyl alcohol fiber of claim 14 being of weight average molecular weight between about 1,500,000 and about 2,500,000.
Claim 18
Dependent Claim
20 words
Tho polyvinyl alcohol fiber of claim 5 being of weight average molecular weight of between about 1,000,000 and about 4.000,000.
Claim 19
Dependent Claim
19 words
The polyvinyl alcohol fiber of claim 16 being of weight average molecular weight between about 1,500,000 and about 2,500,000.
Claim 20
Dependent Claim
23 words
The polyvinyl alcohol fiber of claim 1 having a tenacity at least about 14 g/denier and a tensile modulus least about 300 g/denier.
Claim 21
Dependent Claim
16 words
The polyvinyl alcohol fiber of claim 18 having a tensile modulus at least about 400 g/denier.
Claim 22
Dependent Claim
16 words
The polyvinyl alcohol fiber of claim 18 having a tensile modulus at least about 550 g/denier.
Claim 23
Dependent Claim
16 words
The polyvinyl alchohol fiber of claim 20 having a melting temperature at least about 245° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |