US2774759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of choline base and choline salts
Assignee: Wyeth Holdings LLC
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Filing: 1955-01-06
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Granted: 1956-12-18
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Expires: 1975-01-06
Abstract
No abstract record available.
Inventors
- 👤 Eben G Blackett
- 👤 Arnold J Soliday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:45
CPC Classifications
C; C07; C07D; C07D475/00; C07D475/02; C07D475/04; C07C; C07C213/00; C07C213/04; C07C213/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
IN THE PREPARATION OF A CHOLINE SALT WHEREIN AN AQUEOUS SOLUTION OF TRIMETHYLAMINE IS REACTED WITH ETHYLENE OXIDE TO FORM CHOLINE BASE, THE IMPROVEMENT WHICH COMPRISES FIRST PARTIALLY NEUTRALIZING THE AQUEOUS SOLUTION OF CHOLINE BASE WITH AN ACID, DISTILLING OFF THE UNREACTED TRIMETHYLAMINE UNDER VACUUM, AND COMPLETELY NEUTRALIZING THE REMAINING CHOLINE BASE.
Claim 2
Dependent Claim
52 words
IN THE PREPARATION OF A CHOLINE SALT WHEREIN AN AQUEOUS SOLUTION OF TRIMETHYLAMINE IS REACTED WITH ETHYLENE OXIDE TO FORM CHOLINE BASE, THE IMPROVEMENT WHICH COMPRISES FIRST PARTIALLY NEUTRALIZING THE AQUEOUS SOLUTION OF CHOLINE BASE WITH AN ACID, DISTILLING OFF THE UNREACTED TRIMETHYLAMINE UNDER VACUUM, AND COMPLETELY NEUTRALIZING THE REMAINING CHOLINE BASE.
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) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |