US2604471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of a stable cellulose nitrate having good adhesive characteristics
Assignee: Eastman Kodak Co
•
Filing: 1949-11-23
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Granted: 1952-07-22
•
Expires: 1969-11-23
Abstract
No abstract record available.
Inventors
- 👤 Donald J Kridel
- 👤 William J Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:22
CPC Classifications
C; C08; C08B; C08B5/00; C08B5/02; C08B5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A MEHOD OF PREPARING A STABLE CELLULOSE NITRATE HAVING GOOD ADHESIVE CHARACTERISTICS WHICH COMPRISES HEATING CELLULOSE NITRATE HAVING A 10-12% NITROGEN CONTENT AND 2-80 SECONDS VISCOSITY WITH A 10-30% SOLUTION OF SULFURIC ACID IN A DILUENT UNTIL 0.3-3% SULFATE CONTENT IS IMPARTED THERETO, REMOVING THE LIQUID FROM THE CELULOSE NITRATE AND THEN SOAKING IT IN A SOLUTION OF AT LEAST .01% CONCENTRATION OF AN ALKALINE MATERIAL, SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METAL HYDROXIDES AND THE ALKALI METAL SALST OF WEAKS ACIDS FOR A TIME SUFFICIENT TO IMPART GOOD STABILITY TO THE CELLULOSE ESTER.
Claim 2
Dependent Claim
96 words
A MEHOD OF PREPARING A STABLE CELLULOSE NITRATE HAVING GOOD ADHESIVE CHARACTERISTICS WHICH COMPRISES HEATING CELLULOSE NITRATE HAVING A 10-12% NITROGEN CONTENT AND 2-80 SECONDS VISCOSITY WITH A 10-30% SOLUTION OF SULFURIC ACID IN A DILUENT UNTIL 0.3-3% SULFATE CONTENT IS IMPARTED THERETO, REMOVING THE LIQUID FROM THE CELULOSE NITRATE AND THEN SOAKING IT IN A SOLUTION OF AT LEAST .01% CONCENTRATION OF AN ALKALINE MATERIAL, SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METAL HYDROXIDES AND THE ALKALI METAL SALST OF WEAKS ACIDS FOR A TIME SUFFICIENT TO IMPART GOOD STABILITY TO THE CELLULOSE ESTER.
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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) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |