Patent EP0256524A1 successfully refreshed from Google Patents.
Patent US3364200A successfully refreshed from Google Patents.
US3364200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidized cellulose product and method for preparing the same
Assignee: Johnson and Johnson
•
Filing: 1965-05-19
•
Granted: 1968-01-16
•
Expires: 1985-05-19
Abstract
No abstract record available.
Inventors
- 👤 William H Ashton
- 👤 Charles E Moser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:19
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/02; C08B15/04; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61L15/42; A61L15/64; D; D04; D04B; D04B1/00; D04B1/14; A61L2400/00; A61L2400/04; D10; D10B; D10B2201/00; D10B2201/01; D10B2201/20; D10B2201/22; D10B2201/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN THE PREPARATION OF OXIDIZED CELLULOSE BY THE PROCESS OF TREATING CELLULOSE WOUND IN LAYERS AROUND A PERFORATED CORE WITH AN OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF NITROGEN TETROXIDE AND MIXTURES THEREOF, WASHING THE RESULTING OXIDIZED CELLULOSE WITH A NONTOXIC WATER-IMMISCIBLE SOLVENT FOR SAID OXIDIZING AGENT, WASHING SAID OXIDIZED CELLULOSE FIRST WITH A WATER SOLUBLE LOWER ALIPHATIC ALCOHOL, AND SUBSEQUENTLY WASHING THE OXIDIZED CELLULOSE WITH A SUBSTNATIALLY ANHYDROUS LOWER ALIPHATIC ALCOHOL HAVING AN AFFINITY FOR WATER, WHEREIN SAID OXIDATION BY SAID OXIDIZING AGENT AND SAID WASHINGS ARE EFFECTED BY PASSING THEM THROUGH SAID PREFORATED CORE AND THE SURROUNDING CELLULOSE LAYERS, THE IMPROVEMENT WHEREIN WASHES CONSISTING OF AN AQUEOUS SOLUTION OF A WATER SOLUBLE LOWER ALIPHATIC ALCOHOL CONTAINING SAID ALCOHOL IN A CONCENTRATION RANGE FROM ABOUT 20 PERCENT TO 80 PERCENT ALCOHOL BY VOLUME ARE SUBSTITUTED FOR THE FIRST OF SAID ALCOHOL WASHES.
Claim 2
Dependent Claim
144 words
IN THE PREPARATION OF OXIDIZED CELLULOSE BY THE PROCESS OF TREATING CELLULOSE WOUND IN LAYERS AROUND A PERFORATED CORE WITH AN OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF NITROGEN TETROXIDE AND MIXTURES THEREOF, WASHING THE RESULTING OXIDIZED CELLULOSE WITH A NONTOXIC WATER-IMMISCIBLE SOLVENT FOR SAID OXIDIZING AGENT, WASHING SAID OXIDIZED CELLULOSE FIRST WITH A WATER SOLUBLE LOWER ALIPHATIC ALCOHOL, AND SUBSEQUENTLY WASHING THE OXIDIZED CELLULOSE WITH A SUBSTNATIALLY ANHYDROUS LOWER ALIPHATIC ALCOHOL HAVING AN AFFINITY FOR WATER, WHEREIN SAID OXIDATION BY SAID OXIDIZING AGENT AND SAID WASHINGS ARE EFFECTED BY PASSING THEM THROUGH SAID PREFORATED CORE AND THE SURROUNDING CELLULOSE LAYERS, THE IMPROVEMENT WHEREIN WASHES CONSISTING OF AN AQUEOUS SOLUTION OF A WATER SOLUBLE LOWER ALIPHATIC ALCOHOL CONTAINING SAID ALCOHOL IN A CONCENTRATION RANGE FROM ABOUT 20 PERCENT TO 80 PERCENT ALCOHOL BY VOLUME ARE SUBSTITUTED FOR THE FIRST OF SAID ALCOHOL WASHES.
References Cited (Backward Citations)
US2448892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |