Patent US3049538A successfully refreshed from Google Patents.
US3049538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the stabilization of starch ethers
Assignee: Hercules Powder Co
•
Filing: 1960-03-21
•
Granted: 1962-08-14
•
Expires: 1980-03-21
Abstract
No abstract record available.
Inventors
- 👤 Robert A Brobst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:49
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
IN THE PROCESS OF MAKING STARCH ETHERS WHEREIN STARCH IS CONTACTED WITH AN ALKALI, THE ALKALI STARCH IS ETHERIFIED AND THE EXCESS ALKALI IS NEUTRALIZED, THE IMPROVEMENT WHICH COMPRISES EMPLOYING NITRIC ACID AS THE NEUTRALIZING AGENT WHEREBY A PRODUCT OF SUBSTANTIALLY INCREASED STABILLITY TO DISCOLORATION IS OBTAINED.
Claim 2
Dependent Claim
47 words
IN THE PROCESS OF MAKING STARCH ETHERS WHEREIN STARCH IS CONTACTED WITH AN ALKALI, THE ALKALI STARCH IS ETHERIFIED AND THE EXCESS ALKALI IS NEUTRALIZED, THE IMPROVEMENT WHICH COMPRISES EMPLOYING NITRIC ACID AS THE NEUTRALIZING AGENT WHEREBY A PRODUCT OF SUBSTANTIALLY INCREASED STABILLITY TO DISCOLORATION IS OBTAINED.
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) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |