Patent US2732279A successfully refreshed from Google Patents.
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
2026-10-25 05:08
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.
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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) | 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 |