US2573990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of medicinal creosote
Assignee: Crossett Lumber Co
•
Filing: 1948-03-08
•
Granted: 1951-11-06
•
Expires: 1968-03-08
Abstract
No abstract record available.
Inventors
- 👤 Lloyd T Sandborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:20
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/005; A; A61; A61K; A61K35/00; A61K35/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN THE PROCESS OF RECOVERING MEDICINAL CREOSOTE FROM AN AQUEOUS ALKALINE PHENOLATE SOLUTION FORMED BY REACTING WOOD OILS WITH AN AQUEOUS SOLUTION OF CAUSTIC ALKALI, THE STEP WHICH CONSISTS IN EXTRACTING FROM SAID SOLUTION ONLY THOSE CONSTITUENTS HAVING A LOWER SPECIFIC GRAVITY THAN THE PRODUCT SOUGHT WITH A LIQUID ORGANIC SOLVENT FOR WOOD OIL WHICH IS IMMISCIBLE IN AND CHEMICALLY INERT TOWARD SAID AQUEOUS ALKALINE SOLUTION.
Claim 2
Dependent Claim
66 words
IN THE PROCESS OF RECOVERING MEDICINAL CREOSOTE FROM AN AQUEOUS ALKALINE PHENOLATE SOLUTION FORMED BY REACTING WOOD OILS WITH AN AQUEOUS SOLUTION OF CAUSTIC ALKALI, THE STEP WHICH CONSISTS IN EXTRACTING FROM SAID SOLUTION ONLY THOSE CONSTITUENTS HAVING A LOWER SPECIFIC GRAVITY THAN THE PRODUCT SOUGHT WITH A LIQUID ORGANIC SOLVENT FOR WOOD OIL WHICH IS IMMISCIBLE IN AND CHEMICALLY INERT TOWARD SAID AQUEOUS ALKALINE SOLUTION.
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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) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |