US2992215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange starches which retain their original granular form and process for making same
Assignee: Individual
•
Filing: 1960-05-24
•
Granted: 1961-07-11
•
Expires: 1980-05-24
Abstract
No abstract record available.
Inventors
- 👤 Austin L Bullock
- 👤 John D Guthrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:43
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/003; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
A PROCESS FOR MAKING A GRANULAR ANION EXCHANGE MATERIAL WHICH COMPRISES REFLUXING NATIVE GRENULAR STARCH FOR FROM 2 TO 5 HOURS WITH SOLUTION OF 2 TO 3 PERCENT BY WEIGHT OF FORMALDEHYDE IN ACETONE ACIDIFIED TO ABOUT PH 2 WITH MINRAL ACID, WASHING THE REFLUXED STARCH FREE FROM FORMALDEHYDE WITH WATER, DRYING THE WASHED STARCH, SUS PENDING THE DRIED STARCH IN AN AQUEOUS SOLUTION OF 2-CHLOROTRIETHYLAMINE HYDROCHLORIDE, MIXING THE SUSPENDED STARCH WITH A 20 TO 40 PERCENT WEIGHT AQUEOUS SOLUTION OF SODIUM HYDROXIDE, HEATING AT ABOUT 80*C. FOR 10 TO 30 MINUTES, AND THE WASHING ANDDRYING STARCH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |