US2579295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing 7-dehydrosterols and esters
Assignee: Hartford National Bank and Trust Co
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Filing: 1947-04-28
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Granted: 1951-12-18
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Expires: 1967-04-28
Abstract
No abstract record available.
Inventors
- 👤 Buisman Jan Anne Keverling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:02
CPC Classifications
C; C07; C07J; C07J9/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A METHOD OF PREPARING A 7-DEHYDROSTEROL WHICH COMPRISES SUBJECTING A 7-HYDROXYSTEROL-3MONOESTER TO THE ACTION OF AN INORGANIC ACID HALIDE IN A TERTIARY AMINE WHILE HEATING THE LATTER TO A BOILING TEMPERATURE WITH THE EXCLUSION OF OXYGEN WHEREBY THE HYDROXYL GROUP AT THE 7-POSITION IS SPLIT OFF AND A 7-DEHYDROSTEROL ESTER IS FORMED.
Claim 2
Independent Claim
52 words
A METHOD OF PREPARING A 7-DEHYDROSTEROL WHICH COMPRISES SUBJECTING A 7-HYDROXYSTEROL-3MONOESTER TO THE ACTION OF AN INORGANIC ACID HALIDE IN A TERTIARY AMINE WHILE HEATING THE LATTER TO A BOILING TEMPERATURE WITH THE EXCLUSION OF OXYGEN WHEREBY THE HYDROXYL GROUP AT THE 7-POSITION IS SPLIT OFF AND A 7-DEHYDROSTEROL ESTER IS FORMED.
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) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |