US2766255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
alpha-methyltryptophane and salts thereof
Assignee: Merck and Co Inc
•
Filing: 1953-10-09
•
Granted: 1956-10-09
•
Expires: 1973-10-09
Abstract
No abstract record available.
Inventors
- 👤 Iii Karl Pfister
- 👤 William J Leanza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:06
CPC Classifications
C; C07; C07D; C07D403/00; C07D403/02; C07D403/06; C07D209/00; C07D209/02; C07D209/04; C07D209/10; C07D209/18; C07D209/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
25 words
A COMPOUND FROM THE GROUP CONSISTING OF A-METHYLTRYPTOPHANE, ALKALI METAL SALTS OF A-METHYLTRYPTOPHANE, ALKALINE EARTH METAL SALTS OF A-METHYLTRYPTOPHANE AND MINERAL ACID SALTS OF A-METHYLTRYPTOPHANE.
Claim 2
Dependent Claim
25 words
A COMPOUND FROM THE GROUP CONSISTING OF A-METHYLTRYPTOPHANE, ALKALI METAL SALTS OF A-METHYLTRYPTOPHANE, ALKALINE EARTH METAL SALTS OF A-METHYLTRYPTOPHANE AND MINERAL ACID SALTS OF A-METHYLTRYPTOPHANE.
Claim 3
Dependent Claim
26 words
THE PROCESS WHICH COMPRISES INTIMATELY CONTACTING INDOLYLACETONE WITH AN ALKALI METAL CYANIDE AND AMMONIUM CARBONATE TO PRODUCE 5-METHYL-5-SKATYLHYDRANTOIN, AND HYDROLYZING SAID HYDANTOIN TO PRODUCE A METHYLTRYPTOPHANE.
Claim 4
Dependent Claim
26 words
THE PROCESS WHICH COMPRISES INTIMATELY CONTACTING INDOLYLACETONE WITH AN ALKALI METAL CYANIDE AND AMMONIUM CARBONATE TO PRODUCE 5-METHYL-5-SKATYLHYDRANTOIN, AND HYDROLYZING SAID HYDANTOIN TO PRODUCE A METHYLTRYPTOPHANE.
References Cited (Backward Citations)
US2527366A
Cited
US2557920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-09 | 1960-04-09 | 1960-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-09 | 1964-04-09 | 1964-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-09 | 1968-04-09 | 1968-10-09 | $7700.00 | Window Closed / Lapsed |