US2744131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing threo-l-phenyl-i
Assignee: —
•
Filing: —
•
Granted: 1956-05-01
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Expires: 1973-05-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:00
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/62; C07C69/63; C07B; C07B2200/00; C07B2200/07
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
50 words
A PROCESS FOR PREPARING THE 1,3-ACETOXY-, 1,3-BISDICHLOROACETOXY-, 1-DICHLOROACETOXY-3- ACETOXY - AND 1-ACETOXY-3-DICHLOROACETOXY COMPOUNDS OF THREO-1-PHENYL-2AMINO-PROPANE HYDROCHLORIDE, WHICH COMPRISES TREATING, IN AN ANHYDROUS MEDIUM AND AT A TEMPERATURE NOT HIGHER THAN 35* C., THREO-1-PHENYL-2-AMINO-1,3--PROPANEDIOL WITH HYDROCHLORIC ACID AND AN ACETYLATING AGENT TAKEN FROM THE GROUP CONSISTING OF ACETYL CHLORIDE AND DICHLOROACETYLCHLORIDE.
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) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |