Patent US2989520A successfully refreshed from Google Patents.
US2989520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonium ether derivatives of starch
Assignee: Ingredion Inc
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Filing: 1959-04-22
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Granted: 1961-06-20
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Expires: 1979-04-22
Abstract
No abstract record available.
Inventors
- 👤 Morton W Rutenberg
- 👤 Joseph L Volpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:19
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
AN ETHERIFICATION PRODUCT OF STARCH HAVING THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
10 words
AN ETHERIFICATION PRODUCT OF STARCH HAVING THE FOLLOWING STRUCTURAL FORMULA:
References Cited (Backward Citations)
CA525107A
Cited
US2580351A
Cited
US2580352A
Cited
US2773057A
Cited
US2802000A
Cited
US2883375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |