US2715141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically active isopropyl arterenol
Assignee: Delmar Chemicals Inc
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Filing: 1952-03-27
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Granted: 1955-08-09
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Expires: 1972-03-27
Abstract
No abstract record available.
Inventors
- 👤 Geza S Delmar
- 👤 Macallum Ernest Neil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:20
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/367
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS FOR DERIVING A SALT OF 1-ISOPROPYLARTERENOL COMPRISING REACTING A MIXTURE OF EQUIVALENT AMOUNTS OF RACEMIC ISOPROPYL ARTERENOL SULFATE AND D-TARTARIC ACID DISSOLVED IN WATER WITH SUFFICIENT BARIUM HYDROXIDE TO NEUTRALIZE THE SULFATE PRESENT AND FORM A PRECIPITATE OF BARIUM SULFATE WHILE THE RACEMIC ISOPROPYL ARTERENOL D-TARTRATE REMAINS IN SOLUTION, SEPARATING THE PRECIPITATE OF BARIUM SULFATE FORMED, AND CONCENTRATING THE SOLUTION OF RACEMIC ISOPROPYL ARTERENOL D-TARTRATE, RESOLVING THE CONCENTRATE BY FRACTIONAL CRYSTALLIZATION FROM A SOLVENT, REMOVING THE CRYSTALS OF D-ISOPROPYL ARTERENOL-DTARTRATE, CONCENTRATING THE FILTRATE TO OBTAIN THE 1-ISOPROPYL ARTERENOL D-TARTRATE, AND REACTING SAID 1-ISOPROPYL ARTERENOL D-TARTRATE WITH A SALT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM SULFATE AND BARIUM CHLORIDE TO FORM THE CORRESPONDING SALT.
Claim 2
Dependent Claim
116 words
A PROCESS FOR DERIVING A SALT OF 1-ISOPROPYLARTERENOL COMPRISING REACTING A MIXTURE OF EQUIVALENT AMOUNTS OF RACEMIC ISOPROPYL ARTERENOL SULFATE AND D-TARTARIC ACID DISSOLVED IN WATER WITH SUFFICIENT BARIUM HYDROXIDE TO NEUTRALIZE THE SULFATE PRESENT AND FORM A PRECIPITATE OF BARIUM SULFATE WHILE THE RACEMIC ISOPROPYL ARTERENOL D-TARTRATE REMAINS IN SOLUTION, SEPARATING THE PRECIPITATE OF BARIUM SULFATE FORMED, AND CONCENTRATING THE SOLUTION OF RACEMIC ISOPROPYL ARTERENOL D-TARTRATE, RESOLVING THE CONCENTRATE BY FRACTIONAL CRYSTALLIZATION FROM A SOLVENT, REMOVING THE CRYSTALS OF D-ISOPROPYL ARTERENOL-DTARTRATE, CONCENTRATING THE FILTRATE TO OBTAIN THE 1-ISOPROPYL ARTERENOL D-TARTRATE, AND REACTING SAID 1-ISOPROPYL ARTERENOL D-TARTRATE WITH A SALT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM SULFATE AND BARIUM CHLORIDE TO FORM THE CORRESPONDING SALT.
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) | 1958-08-08 | 1959-02-07 | 1959-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-08 | 1963-02-07 | 1963-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-08 | 1967-02-07 | 1967-08-09 | $7700.00 | Window Closed / Lapsed |