Patent US3255221A successfully refreshed from Google Patents.
US3255221A
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US
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Fractionation of alkaline extracts of tree barks
Assignee: Weyerhaeuser Co
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Filing: 1962-11-07
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Granted: 1966-06-07
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Expires: 1982-11-07
Abstract
No abstract record available.
Inventors
- 👤 Lionel E Dowd
- 👤 David L Brink
- 👤 Arthur S Gregory
- 👤 Arnulf K Esterer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:46
CPC Classifications
C; C11; C11B; C11B11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR FRACTIONATING AN AQUEOUS ALKALINE EXTRACT OF TREE BARK CONTAINING WAX, ACID SOLUBLE PHENOLICS, FUSIBLE PHENOLICS AND INFUSIBLE PHENOLICS, COMPRISING (A) AGITATING AND ACIDIFYING THE EXTRACT TO A PH OF NOT MORE THAN 4.0 TO FORM AN AQUEOUS SLURRY OF INSOLUBILIZED WAX, FUSIBLE PHENOLICS AND INFUSIBLE PHENOLICS, AND THE ACID SOLUBLE PHENOLICS REMIAINING IN SOLUTION, (B) EXTRACTING THE ACIDIFIED AQUEOUS SLURRY WITH A WATER-IMMISCIBLE ORGANIC SOLVENT SELECTED FROM THE CLASS CONSISTING OF ALCOHOLS, KETONES, AROMATIC HYDROCARBONS, CHLORINATED ALIPHATIC HYDROCARBONS, ALIPHATIC HYDROCARBONS, OR MIXTURES OF AN ALIPHATIC HYDROCARBON WITH UP TO 25% OF A WATER-IMMISCIBLE POLAR SOLVENT, TO FORM A SOLVENT PHASE CONTAINING AT LEAST THE WAX COMPONENT AND AN IMMISCIBLE AQUEOUS PHASE CONTAINING REMAINDER OF SAID COMPONENTS, (C) SEPARATING THE IMMISCIBLE AQUEOUS AND SOLVENT PHASES, AND (D) SEPARATING FROM THE RESPECTIVE AQUEOUS AND SOLVENT PHASES THE COMPONENTS CARRIED THEREIN.
Claim 2
Dependent Claim
141 words
A PROCESS FOR FRACTIONATING AN AQUEOUS ALKALINE EXTRACT OF TREE BARK CONTAINING WAX, ACID SOLUBLE PHENOLICS, FUSIBLE PHENOLICS AND INFUSIBLE PHENOLICS, COMPRISING (A) AGITATING AND ACIDIFYING THE EXTRACT TO A PH OF NOT MORE THAN 4.0 TO FORM AN AQUEOUS SLURRY OF INSOLUBILIZED WAX, FUSIBLE PHENOLICS AND INFUSIBLE PHENOLICS, AND THE ACID SOLUBLE PHENOLICS REMIAINING IN SOLUTION, (B) EXTRACTING THE ACIDIFIED AQUEOUS SLURRY WITH A WATER-IMMISCIBLE ORGANIC SOLVENT SELECTED FROM THE CLASS CONSISTING OF ALCOHOLS, KETONES, AROMATIC HYDROCARBONS, CHLORINATED ALIPHATIC HYDROCARBONS, ALIPHATIC HYDROCARBONS, OR MIXTURES OF AN ALIPHATIC HYDROCARBON WITH UP TO 25% OF A WATER-IMMISCIBLE POLAR SOLVENT, TO FORM A SOLVENT PHASE CONTAINING AT LEAST THE WAX COMPONENT AND AN IMMISCIBLE AQUEOUS PHASE CONTAINING REMAINDER OF SAID COMPONENTS, (C) SEPARATING THE IMMISCIBLE AQUEOUS AND SOLVENT PHASES, AND (D) SEPARATING FROM THE RESPECTIVE AQUEOUS AND SOLVENT PHASES THE COMPONENTS CARRIED THEREIN.
References Cited (Backward Citations)
US2890231A
Cited
US2880216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |