US3065222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cation exchange starches which retain their original granular form and process for making same
Assignee: Individual
•
Filing: 1960-12-20
•
Granted: 1962-11-20
•
Expires: 1980-12-20
Abstract
No abstract record available.
Inventors
- 👤 Austin L Bullock
- 👤 John D Guthrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:43
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22; C; C08; C08B; C08B31/00; C08B31/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A PROCESS FOR PRODUCING A GRANULAR CATION EXCHANGE MATERIAL WHICH COMPRISES REFLUXING NATIVE GRANULAR STARCH FOR FROM 2 TO 5 HOURS WITH A SOLUTION OF PH 2 CONTAINING 2 TO 3 PERCENT BY WEIGHT OF FORMALDEHYDE IN ACETONE ACIDIFIED WITH A MINERAL ACID, WASHING THE REFLUXED STARCH GRANULES FREE FROM FORMALDEHYDE WITH WATER, DRYING THE WASHED GRANULES, SUSPENDING THE DRIED GRANULES IN AN AQUEOUS SOLUTION OF MONOCHLOROACETIC ACID, POURING THE SUSPENSION INTO AN AQUEOUS SOLUTION OF ABOUT 40 PERCENT BY WEIGHT OF SODIUM HYDROXIDE, ALLOWING THE SUSPENSION IS SODIUM HYDROXIDE TO COOL, WASHING THE COOLED SUSPENSION FIRST WITH WATER THEN WITH ACETONE AND FINALLY DRYING THE PRODUCT TO OBTAIN A GRANULAR MODIFIED STARCH IN WHICH THE ORIGINAL GRANULAR FORM OF THE NATIVE STARCH IS RETAINED.
Claim 2
Dependent Claim
125 words
A PROCESS FOR PRODUCING A GRANULAR CATION EXCHANGE MATERIAL WHICH COMPRISES REFLUXING NATIVE GRANULAR STARCH FOR FROM 2 TO 5 HOURS WITH A SOLUTION OF PH 2 CONTAINING 2 TO 3 PERCENT BY WEIGHT OF FORMALDEHYDE IN ACETONE ACIDIFIED WITH A MINERAL ACID, WASHING THE REFLUXED STARCH GRANULES FREE FROM FORMALDEHYDE WITH WATER, DRYING THE WASHED GRANULES, SUSPENDING THE DRIED GRANULES IN AN AQUEOUS SOLUTION OF MONOCHLOROACETIC ACID, POURING THE SUSPENSION INTO AN AQUEOUS SOLUTION OF ABOUT 40 PERCENT BY WEIGHT OF SODIUM HYDROXIDE, ALLOWING THE SUSPENSION IS SODIUM HYDROXIDE TO COOL, WASHING THE COOLED SUSPENSION FIRST WITH WATER THEN WITH ACETONE AND FINALLY DRYING THE PRODUCT TO OBTAIN A GRANULAR MODIFIED STARCH IN WHICH THE ORIGINAL GRANULAR FORM OF THE NATIVE STARCH IS RETAINED.
References Cited (Backward Citations)
US2853484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |