Patent US3007766A successfully refreshed from Google Patents.
US3007766A
Expired / Lapsed
US
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Production of viscose rayon
Assignee: Akzona Inc
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Filing: 1958-12-19
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Granted: 1961-11-07
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Expires: 1978-12-19
Abstract
No abstract record available.
Inventors
- 👤 Elssner Richard
- 👤 Elling Gertrud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:48
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; Y; Y10; Y10S; Y10S264/00; Y10S264/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR THE PRODUCTION OF HIGH STRENGTH VISCOSE RAYON THREADS AND FIBERS HAVING A HIGH MODULES DETERMINED BY THE FOLLOWING FORMULA: M=100XS DIVIDED BY E, WHEREIN M IS THE MODULUS, S IS THE DRY STRENGTH IN GRAMS PER DENIER, AND E IS THE DRY ELONGATION, WHICH COMPRISES EXTRUDING VISCOSE CONTAINING ABOUT 3.0 TO 50 GRAMS PER KILOGRAM OF VISCOSE, OF AN ALKALI METAL SALT OF THE CLASS CONSISTING OF SODIUM SULFATE AND POTASSIUM SULFATE, ABOUT 0.3 TO 3.0 GRAMS PER KILOGRAM OF VISCOSE, OF A MODIFIER OF THE CLASS CONSISTING OF POLYETHYLENE GLYCOLS, ETHOXYLATED AMINES AND THEIR QUATERNIZED DERIVATIVES, INTO AN AQUEOUS ACID ZINC-CONTAINING SPIN BATH, PASSING THE THUS PRODUCED THREADS TO AN INTERMEDIATE BATH CONTAINING FORMALDEHYDE, AND FINALLY COLLECTING THE THREADS.
Claim 2
Dependent Claim
123 words
A PROCESS FOR THE PRODUCTION OF HIGH STRENGTH VISCOSE RAYON THREADS AND FIBERS HAVING A HIGH MODULES DETERMINED BY THE FOLLOWING FORMULA: M=100XS DIVIDED BY E, WHEREIN M IS THE MODULUS, S IS THE DRY STRENGTH IN GRAMS PER DENIER, AND E IS THE DRY ELONGATION, WHICH COMPRISES EXTRUDING VISCOSE CONTAINING ABOUT 3.0 TO 50 GRAMS PER KILOGRAM OF VISCOSE, OF AN ALKALI METAL SALT OF THE CLASS CONSISTING OF SODIUM SULFATE AND POTASSIUM SULFATE, ABOUT 0.3 TO 3.0 GRAMS PER KILOGRAM OF VISCOSE, OF A MODIFIER OF THE CLASS CONSISTING OF POLYETHYLENE GLYCOLS, ETHOXYLATED AMINES AND THEIR QUATERNIZED DERIVATIVES, INTO AN AQUEOUS ACID ZINC-CONTAINING SPIN BATH, PASSING THE THUS PRODUCED THREADS TO AN INTERMEDIATE BATH CONTAINING FORMALDEHYDE, AND FINALLY COLLECTING THE THREADS.
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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) | 1964-11-06 | 1965-05-08 | 1965-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-06 | 1969-05-08 | 1969-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-06 | 1973-05-08 | 1973-11-07 | $7700.00 | Window Closed / Lapsed |