US2793231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of maleuric acid
Assignee: Uniroyal Inc
•
Filing: 1954-12-15
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Granted: 1957-05-21
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Expires: 1974-12-15
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Newby
- 👤 Robert H Snyder
- 👤 Howard A Hageman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:46
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1854; C07C273/1863
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A METHOD OF PREPARING MALEURIC ACID WHICH COMPRISES TRITURATING MALEIC AHYDRIDE WITH UREA IN THE PRESENCE OF AN INERT SATURATED ALIPHATIC HYDROCARBON WHICH NORMALLY BOILS AT A TEMPERATURE IN THE RANGE OF ABOUT 85*C. TO ABOUT 120*C. AND HEATING UNDER REFLUX KTHE MIX SUFFICIENTLY HIGH TO CAUSE BOILING OF THE HYDROCARBON.
Claim 2
Independent Claim
51 words
A METHOD OF PREPARING MALEURIC ACID WHICH COMPRISES TRITURATING MALEIC AHYDRIDE WITH UREA IN THE PRESENCE OF AN INERT SATURATED ALIPHATIC HYDROCARBON WHICH NORMALLY BOILS AT A TEMPERATURE IN THE RANGE OF ABOUT 85*C. TO ABOUT 120*C. AND HEATING UNDER REFLUX KTHE MIX SUFFICIENTLY HIGH TO CAUSE BOILING OF THE HYDROCARBON.
References Cited (Backward Citations)
US2717908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |