US2756259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing quaternary ammonium borohydrides
Assignee: Metal Hydrides Inc
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Filing: 1954-05-17
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Granted: 1956-07-24
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Expires: 1974-05-17
Abstract
No abstract record available.
Inventors
- 👤 Robert W Bragdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:21
CPC Classifications
C; C07; C07F; C07F5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
THE METHOD FOR PREPARING TETRAMETHYLAMMONIUM BOROHYDRIDE WHICH COMPRISES MIXING A SUBSTANTIALLY SATURATED SOLUTION OF TETRAMETHYLAMMONIUM HYDROXIDE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL AND MIXTURES THEREOF WITH A SUBSTANTIALLY SATURATED SOLUTION IN METHANOL OF A MIXTURE OF SODIUM BOROHYDRIDE AND SODIUM METHOXIDE THEREBY PRECIPITATING TETRAMETHYLAMMONIUM BOROHYDRIDE IN SUBSTANTIALLY QUANTITATIVE YIELD IN THE RESULTING REACTING LIQUOR WHICH INCLUDES SODIUM METHOXIDE IN SOLUTION THEREIN, THE AMOUNT OF TETRAMETHYLAMMONIUM HYDROXIDE USED BEING AT LEAST EQUAL TO THE AMOUNT THEORETICALLY REQUIRED TO REACT COMPLETELY WITH THE AMOUNT OF SODIUM BOROHYDRIDE USED TO FORM TETRAMETHYLAMMONIUM BOROHYDRIDE, THE RELATIVE AMOUNTS OF SODIUM BOROHYDRIDE AND SODIUM METHOXIDE IN SAID MIXTURE CORRESPONDING TO THE RELATIVE PROPORTIONS OF THESE COMPOUNDS IN A REACTION MIXTURE RESULTING FROM THE REACTION OF SODIUM HYDRIDE AND METHYL BORATE.
Claim 2
Independent Claim
129 words
THE METHOD FOR PREPARING TETRAMETHYLAMMONIUM BOROHYDRIDE WHICH COMPRISES MIXING A SUBSTANTIALLY SATURATED SOLUTION OF TETRAMETHYLAMMONIUM HYDROXIDE IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL AND MIXTURES THEREOF WITH A SUBSTANTIALLY SATURATED SOLUTION IN METHANOL OF A MIXTURE OF SODIUM BOROHYDRIDE AND SODIUM METHOXIDE THEREBY PRECIPITATING TETRAMETHYLAMMONIUM BOROHYDRIDE IN SUBSTANTIALLY QUANTITATIVE YIELD IN THE RESULTING REACTING LIQUOR WHICH INCLUDES SODIUM METHOXIDE IN SOLUTION THEREIN, THE AMOUNT OF TETRAMETHYLAMMONIUM HYDROXIDE USED BEING AT LEAST EQUAL TO THE AMOUNT THEORETICALLY REQUIRED TO REACT COMPLETELY WITH THE AMOUNT OF SODIUM BOROHYDRIDE USED TO FORM TETRAMETHYLAMMONIUM BOROHYDRIDE, THE RELATIVE AMOUNTS OF SODIUM BOROHYDRIDE AND SODIUM METHOXIDE IN SAID MIXTURE CORRESPONDING TO THE RELATIVE PROPORTIONS OF THESE COMPOUNDS IN A REACTION MIXTURE RESULTING FROM THE REACTION OF SODIUM HYDRIDE AND METHYL BORATE.
References Cited (Backward Citations)
US2534533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |