Patent US2687428A successfully refreshed from Google Patents.
US2687428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing aconitate fumarate adducts
Assignee: Monsanto Chemicals Ltd
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Filing: 1951-05-24
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Granted: 1954-08-24
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Expires: 1971-05-24
Abstract
No abstract record available.
Inventors
- 👤 Dazzi Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:56
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD WHICH COMPRISES HEATING AT A TEMPERATURE OF AT LEAST 200* C., A TRIALKYL ACONITATE IN WHICH EACH ALKYL RADICAL HAS FROM 1 TO 4 CARBON ATOMS WITH A DIALKYL FUMARATE IN WHICH EACH ALKYL RADICAL HAS FROM 1 TO 4 CARBON ATOMS, AND RECOVERING FROM THE RESULTING REACTION PRODUCT AND ADDUCT IN WHICH 1 MOLE OF THE SAID ACONITATE IS COMBINED WITH 1 MOLE OF SAID FUMARATE.
Claim 2
Independent Claim
69 words
THE METHOD WHICH COMPRISES HEATING AT A TEMPERATURE OF AT LEAST 200* C., A TRIALKYL ACONITATE IN WHICH EACH ALKYL RADICAL HAS FROM 1 TO 4 CARBON ATOMS WITH A DIALKYL FUMARATE IN WHICH EACH ALKYL RADICAL HAS FROM 1 TO 4 CARBON ATOMS, AND RECOVERING FROM THE RESULTING REACTION PRODUCT AND ADDUCT IN WHICH 1 MOLE OF THE SAID ACONITATE IS COMBINED WITH 1 MOLE OF SAID FUMARATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |