US2684383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of symmetrical triaminobenzene compounds
Assignee: Ringwood Chemical Corp
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Filing: 1951-03-28
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Granted: 1954-07-20
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Expires: 1971-03-28
Abstract
No abstract record available.
Inventors
- 👤 Krueger John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:07
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68; C07C209/30; C07C209/32; C07C209/36; C07C205/00; C07C205/07; C07C205/11; C07C205/12; C07C211/00; C07C211/43; C07C211/44; C07C211/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A METHOD OF PREPARING ACID SALTS OF SYMMETRICAL TRIAMINOBENZENE COMPOUNDS WHICH COMPRISES REDUCING A SYMMETRICAL TRINITROBENZENE COMPOUND WITH A STRONG MINERAL ACID AND PARTICLES OF IRON, AN EXCESS OF REDUCING AGENTS BEING MAINTAINED IN THE REACTION MIXTURE THROUGHOUT THE REDUCTION REACTION, THE MAJOR PART OF THE IRON BEING CONVERTED TO A FERROUS SALT OF SAID ACID, SAID FERROUS SALT REMAINING IN SOLUTION, AND MAINTAINING THE FREE ACID CONTENT OF THE REDUCTION SOLUTION AT NOT LESS THAN ABOUT 3 GRAMS PER 100 CC. UNTIL THE REDUCTION IS ESSENTIALLY COMPLETED, SAID IRON BEING IN EXCESS OF 9 MOLS FOR EACH MOL OF SAID SYMMETRICAL TRINITROBENZENE COMPOUND AND SAID ACID BEING SUFFICEINTLY IN EXCESS OF THE STOICHIOMETRIC AMOUNT REQUIRED TO REACT WITH SAID IRON TO EFFECT REDUCTION OF SAID SYMMETRICAL TRINITROBENZENE COMPOUND TO THE SYMMETRICAL TRIAMINOBENZENE COMPOUND AND TO MAINTAIN THE AFORESAID ACIDITY, AND RECOVERING THE ACID SALTS OF SAID SYMMETRICAL TRIAMINOBENZENE COMPOUNDS FROM THE REACTION MIXTURE.
Claim 2
Independent Claim
154 words
A METHOD OF PREPARING ACID SALTS OF SYMMETRICAL TRIAMINOBENZENE COMPOUNDS WHICH COMPRISES REDUCING A SYMMETRICAL TRINITROBENZENE COMPOUND WITH A STRONG MINERAL ACID AND PARTICLES OF IRON, AN EXCESS OF REDUCING AGENTS BEING MAINTAINED IN THE REACTION MIXTURE THROUGHOUT THE REDUCTION REACTION, THE MAJOR PART OF THE IRON BEING CONVERTED TO A FERROUS SALT OF SAID ACID, SAID FERROUS SALT REMAINING IN SOLUTION, AND MAINTAINING THE FREE ACID CONTENT OF THE REDUCTION SOLUTION AT NOT LESS THAN ABOUT 3 GRAMS PER 100 CC. UNTIL THE REDUCTION IS ESSENTIALLY COMPLETED, SAID IRON BEING IN EXCESS OF 9 MOLS FOR EACH MOL OF SAID SYMMETRICAL TRINITROBENZENE COMPOUND AND SAID ACID BEING SUFFICEINTLY IN EXCESS OF THE STOICHIOMETRIC AMOUNT REQUIRED TO REACT WITH SAID IRON TO EFFECT REDUCTION OF SAID SYMMETRICAL TRINITROBENZENE COMPOUND TO THE SYMMETRICAL TRIAMINOBENZENE COMPOUND AND TO MAINTAIN THE AFORESAID ACIDITY, AND RECOVERING THE ACID SALTS OF SAID SYMMETRICAL TRIAMINOBENZENE COMPOUNDS FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-19 | 1958-01-18 | 1958-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-19 | 1962-01-18 | 1962-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-19 | 1966-01-18 | 1966-07-20 | $7700.00 | Window Closed / Lapsed |