US2806891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of trimethylolethane
Assignee: Heyden Newport Chemical Corp
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Filing: 1954-05-25
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Granted: 1957-09-17
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Expires: 1974-05-25
Abstract
No abstract record available.
Inventors
- 👤 Roy T Gottesman
- 👤 William R Cake
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
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN THE PROCESS OF RECOVERING SUBSTANTIALLY PURE TRIMETHYLOLETHANE FROM TRIMETHYLOLETHANE-CONTAINING AQUEOUS REACTION LIQUORS PRODUCED BY THE ALKALINE CONDENSATION OF FORMALDEHYDE AND PROPIONALDEHYDE IN AN AQUEOUS MEDIUM, THE STEPS COMPRISING EXTRACTING TRIMETHYLOLETHANE FROM SUCH AN AQUEOUS LIQUOR WITH HOT METHYL ISOBUTYL KETONE; RECOVERING CRUDE TRIMETHYLOLETHANE FROM THE TRIMETHYLOLETHANE ISOBUTYL KETONE EXTRACT, AND RECRYSTALLIZING THE CRUDE TRIMETHYLOLETHANE FROM ALCOHOL CONTAINING FROM 1 TO 15% BY WEIGHT OF WATER BASED ON THE TOTAL WEIGHT OF ALCOHOL AND WATER, SAID ALCOHOL BEING SELECTED FROM THE GROUP CONSISTING OF N-BUTANOL,ISOBUTANOL, SEC-BUTANOL, AMYL ALCOHOLS AND MIXTURES THEREOF.
Claim 2
Dependent Claim
91 words
IN THE PROCESS OF RECOVERING SUBSTANTIALLY PURE TRIMETHYLOLETHANE FROM TRIMETHYLOLETHANE-CONTAINING AQUEOUS REACTION LIQUORS PRODUCED BY THE ALKALINE CONDENSATION OF FORMALDEHYDE AND PROPIONALDEHYDE IN AN AQUEOUS MEDIUM, THE STEPS COMPRISING EXTRACTING TRIMETHYLOLETHANE FROM SUCH AN AQUEOUS LIQUOR WITH HOT METHYL ISOBUTYL KETONE; RECOVERING CRUDE TRIMETHYLOLETHANE FROM THE TRIMETHYLOLETHANE ISOBUTYL KETONE EXTRACT, AND RECRYSTALLIZING THE CRUDE TRIMETHYLOLETHANE FROM ALCOHOL CONTAINING FROM 1 TO 15% BY WEIGHT OF WATER BASED ON THE TOTAL WEIGHT OF ALCOHOL AND WATER, SAID ALCOHOL BEING SELECTED FROM THE GROUP CONSISTING OF N-BUTANOL,ISOBUTANOL, SEC-BUTANOL, AMYL ALCOHOLS AND MIXTURES THEREOF.
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) | 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 |