Patent US2542215A successfully refreshed from Google Patents.
US2542215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making carboxymethylcellulose of improved soil suspending properties
Assignee: Wyandotte Chemicals Corp
•
Filing: 1949-07-30
•
Granted: 1951-02-20
•
Expires: 1969-07-30
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:46
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/10; C08B11/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN THE PROCESS OF MAKING SODIUM CARBOXYMETHYLCELLULOSE FROM THE REACTION OF POWDERED CELLULOSE OF FINER THAN 40 MESH PARTICLE SIZE, APPROXIMATELY 89% THEREOF BEING FINER THAN 100 MESH, AND OF 16 LBS./CU. FT. BULK DENSITY, WITH AQUEOUS SOLUTIONS OF NAOH AND CHLOROACETIC ACID, WHEREIN THE POWDERED CELLULOSE IS SUBJECTED TO A TUMBLING ACTION WHILE SAID AQUEOUS SOLUTIONS ARE SPRAYED THEREON, THE IMPROVEMENT WHICH COMPRISES ADJUSTING THE CONCENTRATIONS OF SUCH SOLUTIONS AT THE START OF THE REACTION, AND CONTROLLING THE AMOUNT OF EVAPORATION DURING REACTIONAS TO PRODUCE 30-56% BY WEIGHT OF WATER IN THE PRODUCT AT THE FINISH OF THE REACTION.
Claim 2
Dependent Claim
100 words
IN THE PROCESS OF MAKING SODIUM CARBOXYMETHYLCELLULOSE FROM THE REACTION OF POWDERED CELLULOSE OF FINER THAN 40 MESH PARTICLE SIZE, APPROXIMATELY 89% THEREOF BEING FINER THAN 100 MESH, AND OF 16 LBS./CU. FT. BULK DENSITY, WITH AQUEOUS SOLUTIONS OF NAOH AND CHLOROACETIC ACID, WHEREIN THE POWDERED CELLULOSE IS SUBJECTED TO A TUMBLING ACTION WHILE SAID AQUEOUS SOLUTIONS ARE SPRAYED THEREON, THE IMPROVEMENT WHICH COMPRISES ADJUSTING THE CONCENTRATIONS OF SUCH SOLUTIONS AT THE START OF THE REACTION, AND CONTROLLING THE AMOUNT OF EVAPORATION DURING REACTIONAS TO PRODUCE 30-56% BY WEIGHT OF WATER IN THE PRODUCT AT THE FINISH OF THE REACTION.
References Cited (Backward Citations)
US2131733A
Cited
US2313866A
Cited
US2278612A
Cited
GB572868A
Cited
US2482844A
Cited
US2476331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |