US2580491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reducing the crystallinity of native fibrous cellulosic material
Assignee: Individual
•
Filing: 1950-08-08
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Granted: 1952-01-01
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Expires: 1970-08-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Kyle Ward
- 👤 Carl M Conrad
- 👤 Segal Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/325
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS OF REDUCING THE DEGREE OF CRYSTALLINITY OF A NATIVE FIBROUS CELLULOSIC MATERIAL WITH NO SUBSTANTIAL CHEMICAL DEGRADATION AND IMPAIRMENT OFF THE FIBROUS STRUCTURE COMPRISING IMMERSING THE CELLULOSIC MATERIAL IN A LIQUID TREATING AGENT SELECTED FROM THE GROUP CONSISTING OF AN ANHYDROUS PRIMARY ALKYLAMINE CONTAINING FROM 1 TO 2 CARBON ATOMS, AND A MIXTURE OF AT LEAST 50% BY WEIGHT OF AN ANHYDROUS PRIMARY ALKYLAMINE CONTAINING FROM 1 TO 2 CARBON ATOMS AND AN ANHYDROUS PRIMARY ALKYLAMINE CONTAINING FROM 6 TO 7 CARBON ATOMS, MECHANICALLY SEPARATING A SUBSTANTIAL AMOUNT OF THE TREATING AGENT FROM THE TREATMENT MATERIAL, AND SEPARATING SUBSTANTIALLY ALL OF THE REMAINING TREATING AGENT BY EXTRACTION WITH A NON-POLAR ORGANIC SOLVENT.
Claim 2
Dependent Claim
114 words
A PROCESS OF REDUCING THE DEGREE OF CRYSTALLINITY OF A NATIVE FIBROUS CELLULOSIC MATERIAL WITH NO SUBSTANTIAL CHEMICAL DEGRADATION AND IMPAIRMENT OFF THE FIBROUS STRUCTURE COMPRISING IMMERSING THE CELLULOSIC MATERIAL IN A LIQUID TREATING AGENT SELECTED FROM THE GROUP CONSISTING OF AN ANHYDROUS PRIMARY ALKYLAMINE CONTAINING FROM 1 TO 2 CARBON ATOMS, AND A MIXTURE OF AT LEAST 50% BY WEIGHT OF AN ANHYDROUS PRIMARY ALKYLAMINE CONTAINING FROM 1 TO 2 CARBON ATOMS AND AN ANHYDROUS PRIMARY ALKYLAMINE CONTAINING FROM 6 TO 7 CARBON ATOMS, MECHANICALLY SEPARATING A SUBSTANTIAL AMOUNT OF THE TREATING AGENT FROM THE TREATMENT MATERIAL, AND SEPARATING SUBSTANTIALLY ALL OF THE REMAINING TREATING AGENT BY EXTRACTION WITH A NON-POLAR ORGANIC SOLVENT.
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) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |