US2561323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing glutamic acid mono esters
Assignee: Wyeth Holdings LLC
•
Filing: 1948-12-21
•
Granted: 1951-07-17
•
Expires: 1968-12-21
Abstract
No abstract record available.
Inventors
- 👤 Waller Coy Webster
- 👤 Paterson John Christie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:13
CPC Classifications
C; C07; C07C; C07C227/00; C07C227/14; C07C227/18; C07C229/00; C07C229/02; C07C229/04; C07C229/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A METHOD OF PREPARING A GAMMA LOWER ALKYL ESTER OF GLUMATIC ACID WHICH COMPRISES MIXING GLUMATIC ACID, A LOWER ALIPHATIC ALCOHOL AND A SUBSTANTIALLY ANHYDROUS MINERAL ACID, ALLOWING THE REACTION TO TAKE PLACE FOR FROM 1/4 HOUR TO 6 HOURS, PRECIPITATING THE PRODUCT WITH AN ORGANIC ALKALINE SUBSTANCE AND RECOVERING SAID GLUMATIC ACID MONO ESTER THEREFROM.
Claim 2
Independent Claim
56 words
A METHOD OF PREPARING A GAMMA LOWER ALKYL ESTER OF GLUMATIC ACID WHICH COMPRISES MIXING GLUMATIC ACID, A LOWER ALIPHATIC ALCOHOL AND A SUBSTANTIALLY ANHYDROUS MINERAL ACID, ALLOWING THE REACTION TO TAKE PLACE FOR FROM 1/4 HOUR TO 6 HOURS, PRECIPITATING THE PRODUCT WITH AN ORGANIC ALKALINE SUBSTANCE AND RECOVERING SAID GLUMATIC ACID MONO ESTER THEREFROM.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |