US3557084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfite-carbonyl starch complex and method of preparation
Assignee: Keever Co
•
Filing: 1968-06-20
•
Granted: 1971-01-19
•
Expires: 1988-06-20
Abstract
Abstract A SULFITE-CARBONYL STARCH COMPLEX IS PREPARED BY EFFECTING THE INTERACTION OF A CARBONYL-ENRICHED STARCH AND SULFITE IONS. THE CARBONYL STARCH MAY BE A DIALDEHYDE STARCH, MAY BE A CARBONYL-ENRICHED PRODUCT OF THE HYPOCHLORITE OXIDATION OF STARCH, AND THE LIKE. A PREFERRED EMBODIMENT OF THE INVENTION INVOLVES INTERACTING A CARBONYL STARCH AND SULFITE IONS IN AN AQUEOUS SLURRY OF A CARBONYL STARCH CONTAINING ABOUT 1% DISSOLVED SODIUM SULFITE (BASED ON STARCH WEIGHT) AND AT A PH OF ABOUT 6-10.
Inventors
- 👤 Roy G Hyldon
- 👤 Robert L High
- 👤 Fredrick H Anklam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:23
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; C; C08; C08B; C08B31/00; C08B31/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |