Patent US3923837A successfully refreshed from Google Patents.
US3923837A
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Extraction and recovery of cineole
Assignee: Wyeth Holdings LLC
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Filing: 1974-10-15
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Granted: 1975-12-02
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Expires: 1994-10-15
Abstract
Abstract Method of extracting cineole from a terpene fraction containing cineole, by treating the terpene fraction with a strong mineral acid, preferably concentrated sulfuric acid, and thereafter recovering the cineole.
Inventors
- 👤 Curry Beach Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:05
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
THE METHOD OF EXTRACTING CINEOLE FROM A CINEOLE-CONTAINING TERPENE FRACTION WHICH COMPRISES THE STEPS OF: ADDING TO SAID CINEOLE-CONTAINING FRACTION CONCENTRATED SULFURIC ACID RANGING FROM ABOUT 60% TO ABOUT 70% AT A TEMPERATURE BETWEEN ABOUT -20*C AND ABOUT 0*C AND WHEREIN THE RATIO OF SAID ACID ADDED TO CINEOLE RANGES BETWEEN ABOUT 1.25 AND 2.5, BY WEIGHT, BASED ON THE AMOUNT OF CINEOLE IN THE TERPENE FRACTION SO AS TO FORM (A) AN ACID FRACTION COMPRISING STABLE OXONIUM SALT OF SAID CINEOLE AND (B) A HYDROCARBON TERPENE FRACTION, SEPARATING RESULTANT OXONIUM SALT FRACTION FROM THE TERPENE FRACTION, TREATING SO-RECOVERED OXONIUM SALT FRACTION WITH WATER TO CONVERT SAID SALT TO CINEOLE, AND THEREAFTER RECOVERING CINEOLE THEREFROM.
Claim 2
Independent Claim
115 words
THE METHOD OF EXTRACTING CINEOLE FROM A CINEOLE-CONTAINING TERPENE FRACTION WHICH COMPRISES THE STEPS OF: ADDING TO SAID CINEOLE-CONTAINING FRACTION CONCENTRATED SULFURIC ACID RANGING FROM ABOUT 60% TO ABOUT 70% AT A TEMPERATURE BETWEEN ABOUT -20*C AND ABOUT 0*C AND WHEREIN THE RATIO OF SAID ACID ADDED TO CINEOLE RANGES BETWEEN ABOUT 1.25 AND 2.5, BY WEIGHT, BASED ON THE AMOUNT OF CINEOLE IN THE TERPENE FRACTION SO AS TO FORM (A) AN ACID FRACTION COMPRISING STABLE OXONIUM SALT OF SAID CINEOLE AND (B) A HYDROCARBON TERPENE FRACTION, SEPARATING RESULTANT OXONIUM SALT FRACTION FROM THE TERPENE FRACTION, TREATING SO-RECOVERED OXONIUM SALT FRACTION WITH WATER TO CONVERT SAID SALT TO CINEOLE, AND THEREAFTER RECOVERING CINEOLE THEREFROM.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said acid ratio is about 1.9.
References Cited (Backward Citations)
US2799717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |