Patent US5300874A successfully refreshed from Google Patents.
Patent US3227748A successfully refreshed from Google Patents.
US3227748A
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Purification of quaternary ammonium compounds
Assignee: Metal Hydrides Inc
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Filing: 1963-02-25
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Granted: 1966-01-04
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Expires: 1983-02-25
Abstract
No abstract record available.
Inventors
- 👤 Robert W Bragdon
- 👤 Edward A Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:37
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/09; C07; C07C; C07C51/00; C07C51/41; C07C51/412; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN A METHOD FOR PURIFYING A QUATERNARY AMMONIUM COMPOUND CONTAINING AS AN IMPURITY A SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, POTASSIUM HYDROXIDE, POTASSIUM FLUORIDE, POTASSIUM CARBONATE, POTASSIUM CITRATE, POTASSIUM TARTRATE, SODIUM CARBONATE, POTASSIUM SULFATE, AND SOLDIUM SULFATE, SAID QUATERNARY AMMONIUM COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF A TETRAETHYLAMMONIUM COMPOUND, A TETRAPROPYLAMMONIUM COMPOUND, AND A BENZYLTRIMETHYLAMMONIUM COMPOUND, SAID QUATENARY AMMONIUM COMPOUND CONTAINING SUBSTANTIAL AMOUNTS OF SAID IMPURITY AND QUATERNARY AMMONIUM COMPOUND, THE STEP COMPRISING EXTRACTING THE SOLID IMPURE QUATERNARY AMMONIUM COMPOUND WITH AN AMOUNT OF WATER TO FORM TWO IMMISCIBLE LAYERS, ONE OF WHICH CONSISTS ESSENTIALLY OF AN AQUEOUS SOLUTION OF THE SELECTED QUATERNARY AMMONIUM COMPOUND AND THE OTHER CONSISTS ESSENTIALLY OF AN AQUEOUS SOLUTION OF THE SELECTED IMPURITY.
Claim 2
Dependent Claim
123 words
IN A METHOD FOR PURIFYING A QUATERNARY AMMONIUM COMPOUND CONTAINING AS AN IMPURITY A SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, POTASSIUM HYDROXIDE, POTASSIUM FLUORIDE, POTASSIUM CARBONATE, POTASSIUM CITRATE, POTASSIUM TARTRATE, SODIUM CARBONATE, POTASSIUM SULFATE, AND SOLDIUM SULFATE, SAID QUATERNARY AMMONIUM COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF A TETRAETHYLAMMONIUM COMPOUND, A TETRAPROPYLAMMONIUM COMPOUND, AND A BENZYLTRIMETHYLAMMONIUM COMPOUND, SAID QUATENARY AMMONIUM COMPOUND CONTAINING SUBSTANTIAL AMOUNTS OF SAID IMPURITY AND QUATERNARY AMMONIUM COMPOUND, THE STEP COMPRISING EXTRACTING THE SOLID IMPURE QUATERNARY AMMONIUM COMPOUND WITH AN AMOUNT OF WATER TO FORM TWO IMMISCIBLE LAYERS, ONE OF WHICH CONSISTS ESSENTIALLY OF AN AQUEOUS SOLUTION OF THE SELECTED QUATERNARY AMMONIUM COMPOUND AND THE OTHER CONSISTS ESSENTIALLY OF AN AQUEOUS SOLUTION OF THE SELECTED IMPURITY.
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) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |