US3100797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production and crystallization of 3,5-dinitro-o-toluic acid from nitric and sulfuric acid
Assignee: Dow Chemical Co
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Filing: 1958-01-23
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Granted: 1963-08-13
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Expires: 1978-01-23
Abstract
No abstract record available.
Inventors
- 👤 Harris Guy Hendrickson
- 👤 Fischback Bryant Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:55
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/16; C07C201/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
THE PROCESS FOR PRODUCING 3,5-DINITRO-O-TOLUIC ACID CONSISTING ESSENTIALLY OF REACTING BY CONTACTING O-TOLUIC ACID WITH A MIXTURE OF ABOUT 2 TO 2.5 MOLES OF NITRIC ACID AND ABOUT 10 TO 25 MOLES OF SULFURIC ACID PER MOLE OF O-TOLUIC ACID AT A TEMPERATURE OF ABOUT 25 TO 110*C., ACID NITRIC AND SULFURIC ACIDS BEING OF SUCH CONCENTRATIONS THAT THE MIXTURE THEREOF CONTAINS NOT MORE THAN ABOUT 15% BY WEIGHT OF WATER, UNTIL SUBSTANTIAL REACTION HAS OCCURRED, ADJUSTING THE TEMPERATURE OF THE REACTION MIXTURE TO ABOUT 0 TO 30*C. AND SEPARATING FROM THE MIXTURE THE THUS FORMED CRYSTALS OF 3,5-DINTRO-O-TOLUIC ACID.
Claim 2
Dependent Claim
100 words
THE PROCESS FOR PRODUCING 3,5-DINITRO-O-TOLUIC ACID CONSISTING ESSENTIALLY OF REACTING BY CONTACTING O-TOLUIC ACID WITH A MIXTURE OF ABOUT 2 TO 2.5 MOLES OF NITRIC ACID AND ABOUT 10 TO 25 MOLES OF SULFURIC ACID PER MOLE OF O-TOLUIC ACID AT A TEMPERATURE OF ABOUT 25 TO 110*C., ACID NITRIC AND SULFURIC ACIDS BEING OF SUCH CONCENTRATIONS THAT THE MIXTURE THEREOF CONTAINS NOT MORE THAN ABOUT 15% BY WEIGHT OF WATER, UNTIL SUBSTANTIAL REACTION HAS OCCURRED, ADJUSTING THE TEMPERATURE OF THE REACTION MIXTURE TO ABOUT 0 TO 30*C. AND SEPARATING FROM THE MIXTURE THE THUS FORMED CRYSTALS OF 3,5-DINTRO-O-TOLUIC ACID.
References Cited (Backward Citations)
US2435314A
Cited
US2826611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |