Patent US3673167A successfully refreshed from Google Patents.
US3673167A
Expired / Lapsed
US
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Polyvinyl chloride fibers
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1969-10-30
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Granted: 1972-06-27
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Expires: 1989-10-30
Abstract
Abstract Vinyl chloride homo- and co-polymers are made which have uniform cross section, homogeneous structure, great brilliance, and good transparency. They are far superior in these properties to any polyvinyl chloride homo- or co-polymers which were previously known. They may have any desired shape in cross section, for instance those of a square or a star.
Inventors
- 👤 Claude Ledous
- 👤 Albert De Vries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:31
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/28; D01F6/32; C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; D01F6/02; D01F6/08; D01F6/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
33 words
Melt-spun fibers according to claim 1, which have been drawn while hot and have been set, and which have a shrinkage when heated in perchlorethylene at 60* C. of 2 to 4 percent.
Claim 2
Dependent Claim
22 words
Melt-spun fibers according to claim 1 which have a stretchability of 1000 percent at 100* C. and average titre of 70 deniers.
Claim 3
Dependent Claim
31 words
Melt-spun fibers according to claim 1 which have been hot drawn to a 5 to 10 deniers titre and which have a strength of from 3.5 to 4.5 grams per denier.
Claim 4
Dependent Claim
26 words
Melt-spun fibers according to claim 1 which have been drawn at 100* C. and exhibit a specific index of birefringence of 12 X 10 3 .
Claim 5
Dependent Claim
62 words
Melt-spun polyvinyl chloride fibers which are homogeneous in composition and appearance, free from voids and from zones of striction and strangulation, transparent against a black background and of great brilliance and which have a uniform section along the length when viewed under a microscope, said fibers being drawable at 100* C. from substantially greater than 5 times to 8 to 12 times.
Claim 6
Dependent Claim
53 words
Drawn melt-spun polyvinyl chloride fibers which are homogeneous in composition and appearance and which have been drawn to at least ten times their extruded length, and which are transparent and which show no granular structure under the electronic microscope and which have a uniform cross-section along the length when viewed under the microscope.
Claim 7
Dependent Claim
34 words
Drawn melt-spun polyvinyl chloride fibers according to claim 7, which have been drawn at 100* C. exhibiting a molecular orientation as evidenced by a specific index of birefringence of 12 X 10 3 .
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |