US2738252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spundyed rayon
Assignee: Akzona Inc
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Filing: 1951-12-28
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Granted: 1956-03-13
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Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 Lutgerhorst Albertus Gerardus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:31
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS OF MANUFACTURING VISCOSE RAYON YARN DYED WITH A VAT DYE COMPRISING THE STEPS OF ACIDIFYING A REDUCED SOLUTION OF A VAT DYE, SEPARATING THE PRECIPITATED FREE LUECO HYDROXY COMPOUND, DISSOLVING SAID PURIFIED FREE LEUCO COMPOUND IN VISCOSE SPINNING SOLUTION, SPINNING THE RESULTANT SOLUTION TO FORM VISCOSE RAYON YARN, AND OXIDATIVELY DEVELOPING THE DYESTUFF IN THE YARN.
Claim 2
Dependent Claim
58 words
A PROCESS OF MANUFACTURING VISCOSE RAYON YARN DYED WITH A VAT DYE COMPRISING THE STEPS OF ACIDIFYING A REDUCED SOLUTION OF A VAT DYE, SEPARATING THE PRECIPITATED FREE LUECO HYDROXY COMPOUND, DISSOLVING SAID PURIFIED FREE LEUCO COMPOUND IN VISCOSE SPINNING SOLUTION, SPINNING THE RESULTANT SOLUTION TO FORM VISCOSE RAYON YARN, AND OXIDATIVELY DEVELOPING THE DYESTUFF IN THE YARN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |