Patent US3147301A successfully refreshed from Google Patents.
US3147301A
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US
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Sulfo-organic esters of fumaric and maleic acids
Assignee: Dow Chemical Co
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Filing: 1960-11-22
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Granted: 1964-09-01
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Expires: 1980-11-22
Abstract
No abstract record available.
Inventors
- 👤 David P Sheetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:54
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/07; C07C309/12; C08; C08F; C08F28/00; Y; Y10; Y10S; Y10S260/00; Y10S260/21
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
36 words
AN ESTER SELECTED FROM THE GROUP CONSISTING OF MONOAND DI(SULFO-ORGANIC) MALEATES AND MONO- AND DI(SULFOORGANIC) FUMARATES WHEREIN THE SULFO-ORGANIC MOIETY IS PROVIDED BY A HYDROXYSULFONIC ACID, ESTERIFICATION BEING AT THE HYDROXYL GROUP, HAVING THE GENERAL FORMULA:
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |