US2628975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of a substituted amino propane diol
Assignee: Parke Davis and Co LLC
•
Filing: 1951-02-23
•
Granted: 1953-02-17
•
Expires: 1971-02-23
Abstract
No abstract record available.
Inventors
- 👤 Jacob Robert Michel
- 👤 Robert Jacques Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:36
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR THE PRODUCTION OF A NEW SUBSTUTED AMINOPROPANE DIOL, BEING DL-ERYTHRO 2O - CARBOXYBENZAMIDO -1-P-NITROPHENYLPROPANE 1:3-DIO, WHICH COMPRISES CONDENSING P-NITROBENZALDEHYDE WITH ALPHA-PHTHALIMIDOACETALDEHYDE IN THE PRESENCE OF A BASIC CONDENSING AGENT TO PRODUCE A REACTION PRODUCT HAVING A MELTING POINT BETWEEN 145* AND 185* C., REDUCING THAT REACTION PRODUCT BY MEANS OF AN OXIDISABLE ALUMINUM ALKOXIDE, AND HYDROLYSING THE PRODUCT OF REDUCTION UNDER ALKALINE CONDITIONS.
Claim 2
Dependent Claim
66 words
A PROCESS FOR THE PRODUCTION OF A NEW SUBSTUTED AMINOPROPANE DIOL, BEING DL-ERYTHRO 2O - CARBOXYBENZAMIDO -1-P-NITROPHENYLPROPANE 1:3-DIO, WHICH COMPRISES CONDENSING P-NITROBENZALDEHYDE WITH ALPHA-PHTHALIMIDOACETALDEHYDE IN THE PRESENCE OF A BASIC CONDENSING AGENT TO PRODUCE A REACTION PRODUCT HAVING A MELTING POINT BETWEEN 145* AND 185* C., REDUCING THAT REACTION PRODUCT BY MEANS OF AN OXIDISABLE ALUMINUM ALKOXIDE, AND HYDROLYSING THE PRODUCT OF REDUCTION UNDER ALKALINE CONDITIONS.
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) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |