US2806889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of trimethylolethane
Assignee: Heyden Newport Chemical Corp
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Filing: 1954-05-20
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Granted: 1957-09-17
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Expires: 1974-05-20
Abstract
No abstract record available.
Inventors
- 👤 Roy T Gottesman
- 👤 Kenneth T Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:07
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0488
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
THE PROCESS FOR RECOVERING TRIMETHYLOLETHANE FROM AN AQUEOUS SOLUTION CONTAINING TRIMETHYLETHANE IMPURITIES, INCLUDING ALKALI METAL FORMATE AND ORGANIC IMPURITIES, RESULTING FROM CONDENSING FORMALDEHYDE WITH PROPIONALDEHYDE IN AN AQUEOUS MEDIUM CONTAINING ALKALI METAL HYDROXIDE, THE PROCESS COMPRISING THE STEPS OF EXTRACTING TRIMETHYLOLETHANE FROM SUCH AN AQUEOUS SOLUTION WITH A SOLVENT SELECTED FROM THE GROUP CONSISTING OF AMYL ALCOHOL, NORMAL BUTANOL AND MIXTURES THEREOF, THEREBY FORMING A SOLVENT EXTRACT CONTAINING TRIMETHYLOLETHANE, EXTRACTING TRIMETHYLOLETHANE FROM THE SOLVENT EXTRACT WITH WATER, THEREBY FORMING AN AQUEOUS RE-EXTRACTED CONTAINING TRIMETHYLOLETHANE, AND THEREAFTER SEPARATING TRIMETHYLOLETHANE FROM THE AQUEOUS RE-EXTRACT.
Claim 2
Dependent Claim
92 words
THE PROCESS FOR RECOVERING TRIMETHYLOLETHANE FROM AN AQUEOUS SOLUTION CONTAINING TRIMETHYLETHANE IMPURITIES, INCLUDING ALKALI METAL FORMATE AND ORGANIC IMPURITIES, RESULTING FROM CONDENSING FORMALDEHYDE WITH PROPIONALDEHYDE IN AN AQUEOUS MEDIUM CONTAINING ALKALI METAL HYDROXIDE, THE PROCESS COMPRISING THE STEPS OF EXTRACTING TRIMETHYLOLETHANE FROM SUCH AN AQUEOUS SOLUTION WITH A SOLVENT SELECTED FROM THE GROUP CONSISTING OF AMYL ALCOHOL, NORMAL BUTANOL AND MIXTURES THEREOF, THEREBY FORMING A SOLVENT EXTRACT CONTAINING TRIMETHYLOLETHANE, EXTRACTING TRIMETHYLOLETHANE FROM THE SOLVENT EXTRACT WITH WATER, THEREBY FORMING AN AQUEOUS RE-EXTRACTED CONTAINING TRIMETHYLOLETHANE, AND THEREAFTER SEPARATING TRIMETHYLOLETHANE FROM THE AQUEOUS RE-EXTRACT.
References Cited (Backward Citations)
US2400724A
Cited
US2479041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |