US2732279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shozo tachikawa
Assignee: —
•
Filing: —
•
Granted: 1956-01-24
•
Expires: 1973-01-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:30
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/12; D01D5/16; D01D5/06; D01F; D01F2/00; D01F2/06; Y; Y10; Y10S; Y10S264/00; Y10S264/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE PROCESS OF MANUFACTURING ARTIFICIAL FIBER BY THE VISCOSE METHOD COMPRISING SPINNING INTO A BATH HAVING AN ACID CONCENTRATION LOWER THAN 30 GRAMS PER LITER AND A SALT CONCENTRATION OF LOWER THAN 50 GRAMS PER LITER AND A TEMPERATURE BELOW 30* CENTIGRADE, A VISCOSE COMPOSED OF A CELLULOSE XANTHATE DISSOLVED WATER TO A CONCENTRATION WHICH VARIES INVERSELY WITH THE DEGREE OF POLYMERIZATION FROM AT LEAST 6% FOR A DEGREE OF POLYMERIZATION OF 350 TO AT LEAST 1.5% FOR A DEGREE OF POLYMERIZATION ABOVE 750 AND AN ALKALI CONCENTRATION NOT EXCEEDING 2.5 MOLS PER MOL OF CELLULOSE, AND POSITIVELY DRAWING THE FILAMENTS WHILE IMMERSED WITHIN THE BATH AT A CONTROLLED SPEED WHICH INCREASES PROGRESSIVELY AND CONTINUOUSLY WITH THE PROGRESS OF REGENERATION OF THE FILAMENTS UNTIL THE REGENERATION IS COMPLETE.
Claim 2
Dependent Claim
128 words
THE PROCESS OF MANUFACTURING ARTIFICIAL FIBER BY THE VISCOSE METHOD COMPRISING SPINNING INTO A BATH HAVING AN ACID CONCENTRATION LOWER THAN 30 GRAMS PER LITER AND A SALT CONCENTRATION OF LOWER THAN 50 GRAMS PER LITER AND A TEMPERATURE BELOW 30* CENTIGRADE, A VISCOSE COMPOSED OF A CELLULOSE XANTHATE DISSOLVED WATER TO A CONCENTRATION WHICH VARIES INVERSELY WITH THE DEGREE OF POLYMERIZATION FROM AT LEAST 6% FOR A DEGREE OF POLYMERIZATION OF 350 TO AT LEAST 1.5% FOR A DEGREE OF POLYMERIZATION ABOVE 750 AND AN ALKALI CONCENTRATION NOT EXCEEDING 2.5 MOLS PER MOL OF CELLULOSE, AND POSITIVELY DRAWING THE FILAMENTS WHILE IMMERSED WITHIN THE BATH AT A CONTROLLED SPEED WHICH INCREASES PROGRESSIVELY AND CONTINUOUSLY WITH THE PROGRESS OF REGENERATION OF THE FILAMENTS UNTIL THE REGENERATION IS COMPLETE.
References Cited (Backward Citations)
US1494841A
Cited
US1689958A
Cited
US1902102A
Cited
US1968468A
Cited
US2155934A
Cited
US2106111A
Cited
US2076596A
Cited
US2117038A
Cited
GB501495A
Cited
CH263233A
Cited
US2273240A
Cited
US2521450A
Cited
US2607955A
Cited
US2592355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |