US3291789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decausticization of polysaccharide xanthates
Assignee: Continental Group Inc
•
Filing: 1962-06-07
•
Granted: 1966-12-13
•
Expires: 1982-06-07
Abstract
No abstract record available.
Inventors
- 👤 Douglas J Bridgeford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:49
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/12; B01J13/125; B01J39/00; C; C08; C08B; C08B31/00; C08B31/02; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/227; D06M15/233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD OF PREPARING A DECAUSTICIZED SOLUTION OF A FILM-FORMING MATERIAL WHICH COMPRISES CONTACTING A CAUSTIC AQUEOUS SOLUTION OF AN ALKALI XANTHATE OF A FILMFORMING POLYSACCHARIDE WITH AN INSOLUBLE MATERIAL SELECTED FROM THE GROUP CONSISTING OF CATION EXCHANGE MATERIALS IN THE HYDROGEN ION FORM, ANION EXCHANGE MATERIALS IN THE SALT FORM. AND ION RETARDATION MATERIALS IN A SUFFICIENT AMOUNT AND FOR A SUFFICIENT TIME TO REDUCE THE PH OF THE SOLUTION TO LESS THAN ABOUT 13.
Claim 2
Independent Claim
76 words
A METHOD OF PREPARING A DECAUSTICIZED SOLUTION OF A FILM-FORMING MATERIAL WHICH COMPRISES CONTACTING A CAUSTIC AQUEOUS SOLUTION OF AN ALKALI XANTHATE OF A FILMFORMING POLYSACCHARIDE WITH AN INSOLUBLE MATERIAL SELECTED FROM THE GROUP CONSISTING OF CATION EXCHANGE MATERIALS IN THE HYDROGEN ION FORM, ANION EXCHANGE MATERIALS IN THE SALT FORM. AND ION RETARDATION MATERIALS IN A SUFFICIENT AMOUNT AND FOR A SUFFICIENT TIME TO REDUCE THE PH OF THE SOLUTION TO LESS THAN ABOUT 13.
References Cited (Backward Citations)
USRE22489E
Cited
US1852466A
Cited
US1974755A
Cited
US2045349A
Cited
US1955092A
Cited
US2045410A
Cited
US2011156A
Cited
US2422573A
Cited
USRE23013E
Cited
US2502782A
Cited
US2528099A
Cited
US2572848A
Cited
US2805196A
Cited
US2825655A
Cited
US2910380A
Cited
GB867450A
Cited
US3135613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |