Patent US2662893A successfully refreshed from Google Patents.
US2662893A
Expired / Lapsed
US
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Extraction of valuable products from bark
Assignee: State of Oregon
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Filing: 1950-03-28
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Granted: 1953-12-15
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Expires: 1970-03-28
Abstract
No abstract record available.
Inventors
- 👤 Ervin F Kurth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:25
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/22; C07D311/26; C07D311/28; C07D311/32; C11; C11B; C11B11/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
THE PROCESS FOR THE RECOVERY OF VALUABLE PRODUCTS FROM THE BARK OF TREES WHICH COMPRISES EXTRACTING THE BARK WITH A SOLVENT COMPRISING A LOWER ALIPHATIC HYDROCARBON, THEREBY SEPARATING FROM THE BARK A FIRST WAX PRODUCT, EXTRACTING THE BARK FROM WHICH THE SAID FIRST WAX PRODUCT HAS BEEN REMOVED WITH AT LEAST ONE SOLVENT OF THE CLASS CONSISTING OF THE NORMALLY LIQUID AROMATIC HYDROCARBONS AND THE LOWER HALOGENATED ALIPHATIC HYDROCARBONS, THEREBY SELECTIVELY REMOVING FROM THE BARK A SECOND WAX PRODUCT, AND EXTRACTING THE BARK FROM WHICH THE SAID FIRST AND SECOND WAX PRODUCTS HAVE BEEN REMOVED WITH A LOWER ALKYL ETHER, THEREBY SELECTIVELY REMOVING DIHYDROQUERCETIN FROM THE BARK.
References Cited (Backward Citations)
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US531752A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-14 | 1957-06-15 | 1957-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-14 | 1961-06-15 | 1961-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-14 | 1965-06-15 | 1965-12-15 | $7700.00 | Window Closed / Lapsed |