US3107970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of high tenacity viscose rayon
Assignee: Teijin Ltd
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Filing: 1961-09-28
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Granted: 1963-10-22
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Expires: 1981-09-28
Abstract
No abstract record available.
Inventors
- 👤 Kusunose Masatomo
- 👤 Saji Yasuo
- 👤 Koyasu Takeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:14
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; Y; Y10; Y10S; Y10S264/00; Y10S264/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR MANUFACTURING HIGH TENACITY VISCOSE RAYON FILAMENTS COMPRISING HEATING TO A TEMPERATURE IN THE RANGE OF BETWEEN 45*C. AND 70*C. AN UNRIPENED VISCOSE HAVING A SALT INDEX ABOUT 9 AND HAVING A VISCOSITY RANGING FROM 50 TO 400 SECONDS, SAID VISCOSE HAVING AN ALKALI CONTENT RANGING FROM 0.5 TO 0.9 TIMES THE CELLULOSE CONTENT, THEN SPINNING SAID VISCOSE IN ITS HEATED STATE INTO A ACID COAGULATING BATH HELD AT A TEMPERATURE IN THE RANGE OF BETWEEN A MAXIMUM OF 35*C. AND A MINIMUM OF BELOW THE VISCOSE TEMPERATURE BY AT LEAST 20*C., SAID ACID COAGULATING BATH CONTAINING FROM 50 TO 150 GM./LITER NA2SO4, FROM 1 TO 10 GM./LITER FORMALDEHYDE, 30 GM./LITER MAXIMUM ZNSO4 AND 40 GM./LITER MINIMUM H2SO4.
Claim 2
Dependent Claim
120 words
A PROCESS FOR MANUFACTURING HIGH TENACITY VISCOSE RAYON FILAMENTS COMPRISING HEATING TO A TEMPERATURE IN THE RANGE OF BETWEEN 45*C. AND 70*C. AN UNRIPENED VISCOSE HAVING A SALT INDEX ABOUT 9 AND HAVING A VISCOSITY RANGING FROM 50 TO 400 SECONDS, SAID VISCOSE HAVING AN ALKALI CONTENT RANGING FROM 0.5 TO 0.9 TIMES THE CELLULOSE CONTENT, THEN SPINNING SAID VISCOSE IN ITS HEATED STATE INTO A ACID COAGULATING BATH HELD AT A TEMPERATURE IN THE RANGE OF BETWEEN A MAXIMUM OF 35*C. AND A MINIMUM OF BELOW THE VISCOSE TEMPERATURE BY AT LEAST 20*C., SAID ACID COAGULATING BATH CONTAINING FROM 50 TO 150 GM./LITER NA2SO4, FROM 1 TO 10 GM./LITER FORMALDEHYDE, 30 GM./LITER MAXIMUM ZNSO4 AND 40 GM./LITER MINIMUM H2SO4.
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) | 1966-10-21 | 1967-04-22 | 1967-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-21 | 1971-04-22 | 1971-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-21 | 1975-04-22 | 1975-10-22 | $7700.00 | Window Closed / Lapsed |