Patent US3708546A successfully refreshed from Google Patents.
US3708546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of dinitrotoluene
Assignee: SRI International Inc
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Filing: 1972-01-17
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Granted: 1973-01-02
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Expires: 1992-01-17
Abstract
Abstract Mixtures of dinitrotoluene isomers containing extremely small amounts of meta isomers are rapidly prepared in quantitative yield by temperatures in the presence of a small amount of water. Total meta isomer content can readily be kept at a level below about 2 percent by weight.
Inventors
- 👤 C Coon
- 👤 G Mcdonald
- 👤 M Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:03
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
The process of claim 1 wherein the toluene nitration reaction is conducted using about 2 to 10 moles of HNO3 per mole of toluene and wherein the mixture of acids contains 5 to 30 weight percent HNO3, 64 to 95 weight percent H2SO4, and 0 to 7 weight percent water.
Claim 2
Dependent Claim
20 words
The process of claim 2 wherein the nitration reaction is conducted at temperatures of from about -35*C to about -5*C.
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |