US2661370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hexamethylene-1:6-bis-trimethylammonium bitartrate
Assignee: May and Baker Ltd
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Filing: 1951-10-18
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Granted: 1953-12-01
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Expires: 1971-10-18
Abstract
No abstract record available.
Inventors
- 👤 Barber Harry James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:48
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/235; C07C59/245; C07C59/255
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR THE PREPARATION OF HEXAMETHYLENE - 1:6 - BIS - TRIMETHYLAMMONIUM BITARTRATE WHICH COMPRISES REACTING HEXAMETHYLENE DIAMINE WITH A METHYLATING AND QUATERNATING AGENT IN AQUEOUS MIXTURE TO FORM AN ACID-FREE CRUDE REACTION MIXTURE, ADDING TO THAT REACTION MIXTURE A WATER-SOLUBLE SALT OF 2:2-DIHYDROXY-1:1-DINAPHTHYLMETHANE-3:3-DICARBOXYLIC ACID THEREBY TO PRECIPITATE HEXAMETHYLENE-1:6-BIS-TRIMETHYLAMMONIUM SALT OF 2:2-DIHYDROXYL-1:1-DINAPHTHYLMETHANE-3:3-DICARBOXYLIC ACID, ISOLATING THE PRECIPITATE AND CONVERTING THE SAME INTO THE CORRESPONDING BITARTRATE BY REACTION WITH A MEMBER OF THE CLASS CONSISTING OF TARTARIC ACID AND ACID SALTS THEREOF, REMOVING PRECIPITATED 2:2-DIHYDROXY-1:1-DINAPHTHYLMETHANE-3:3 - DICARBOXYLIC ACID, AND RECOVERING THE HEXAMETHYLENE-1:6-BISTRIMETHYLAMMONIUM BITARTRATE THUS FORMED.
Claim 2
Dependent Claim
94 words
A PROCESS FOR THE PREPARATION OF HEXAMETHYLENE - 1:6 - BIS - TRIMETHYLAMMONIUM BITARTRATE WHICH COMPRISES REACTING HEXAMETHYLENE DIAMINE WITH A METHYLATING AND QUATERNATING AGENT IN AQUEOUS MIXTURE TO FORM AN ACID-FREE CRUDE REACTION MIXTURE, ADDING TO THAT REACTION MIXTURE A WATER-SOLUBLE SALT OF 2:2-DIHYDROXY-1:1-DINAPHTHYLMETHANE-3:3-DICARBOXYLIC ACID THEREBY TO PRECIPITATE HEXAMETHYLENE-1:6-BIS-TRIMETHYLAMMONIUM SALT OF 2:2-DIHYDROXYL-1:1-DINAPHTHYLMETHANE-3:3-DICARBOXYLIC ACID, ISOLATING THE PRECIPITATE AND CONVERTING THE SAME INTO THE CORRESPONDING BITARTRATE BY REACTION WITH A MEMBER OF THE CLASS CONSISTING OF TARTARIC ACID AND ACID SALTS THEREOF, REMOVING PRECIPITATED 2:2-DIHYDROXY-1:1-DINAPHTHYLMETHANE-3:3 - DICARBOXYLIC ACID, AND RECOVERING THE HEXAMETHYLENE-1:6-BISTRIMETHYLAMMONIUM BITARTRATE THUS FORMED.
References Cited (Backward Citations)
US2130947A
Cited
US2375853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |