US2758112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of oxidation products of cellulose
Assignee: NAAMLOOZE VENNOOTSCHAP KUNSTZIJDESPINNERIJ NYMA
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Filing: 1952-09-13
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Granted: 1956-08-07
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Expires: 1972-09-13
Abstract
No abstract record available.
Inventors
- 👤 Waning Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/02; C08B15/04; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
PROCESS FOR THE PREPARATION OF OXIDATION PRODUCTS OF CELLULOSE WHICH CONTAIN CARBOXYL GROUPS AND WHICH AND COMPLETELY SOLUBLE IN 1% NAOH, COMPRISING THE STEP OF REACTING CELLULOSE WITH A MIXTURE OF NITRIC ACID HAVING A CONCENTRATION OF 55 TO 70%, 5-20% BY VOLUME OF CONCENTRATED SULFUR ACID, AND 1% BY WEIGHT OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SODIUM NITRITE, NITROGEN MONOXIDE AND NITROUS ACID.
Claim 2
Dependent Claim
67 words
PROCESS FOR THE PREPARATION OF OXIDATION PRODUCTS OF CELLULOSE WHICH CONTAIN CARBOXYL GROUPS AND WHICH AND COMPLETELY SOLUBLE IN 1% NAOH, COMPRISING THE STEP OF REACTING CELLULOSE WITH A MIXTURE OF NITRIC ACID HAVING A CONCENTRATION OF 55 TO 70%, 5-20% BY VOLUME OF CONCENTRATED SULFUR ACID, AND 1% BY WEIGHT OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SODIUM NITRITE, NITROGEN MONOXIDE AND NITROUS ACID.
References Cited (Backward Citations)
US2604471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |