US3236669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose solutions in dimethyl sulfoxide and nitrogen dioxide
Assignee: EIDP Inc
•
Filing: 1963-04-19
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Granted: 1966-02-22
•
Expires: 1983-04-19
Abstract
No abstract record available.
Inventors
- 👤 Harry D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:55
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/02; C08B1/003; C08B3/00; C08B3/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
45 words
A PROCESS WHICH COMPRISES MIXING CELLULOSE WITH AT LEAST 4 PARTS DIMETHYL SULFOXIDE PER PART CELLULOSE AND ADDING THERETO ABOUT FROM 1.0 TO 1.7 PARTS BY WEIGHT OF NITROGEN DIOXIDE PER PART BY WEIGHT OF CELLULOSE AND MIXING UNTIL A SUBSTANTIALLY HOMOGENEOUS SOLUTION IS OBTAINED.
References Cited (Backward Citations)
US3023183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |