Patent US2764609A successfully refreshed from Google Patents.
US2764609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isomerization of dialkyl maleates to dialkyl fumarates
Assignee: Monsanto Chemicals Ltd
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Filing: 1953-07-24
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Granted: 1956-09-25
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Expires: 1973-07-24
Abstract
No abstract record available.
Inventors
- 👤 Harry R Gamrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:09
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/52; C07C69/593; C07C69/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
THE METHOD OF CONVERTING AN ALKYL MALEATE TO AN ALKYL FUMARATE WHICH COMPRISES HEATING THE ALKYL MALEATE IN THE PRESENCE OF A HALIDE OF AN ACID OF A GROUP CONSISTING OF ACIDS OF SULFUR AND ACIDS OF PHOSPHORUS.
Claim 2
Independent Claim
38 words
THE METHOD OF CONVERTING AN ALKYL MALEATE TO AN ALKYL FUMARATE WHICH COMPRISES HEATING THE ALKYL MALEATE IN THE PRESENCE OF A HALIDE OF AN ACID OF A GROUP CONSISTING OF ACIDS OF SULFUR AND ACIDS OF PHOSPHORUS.
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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |