US2642433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-amino-alpha, alpha-diphenylacetic acid derivatives and method of preparing same
Assignee: F Hoffmann La Roche AG
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Filing: 1949-11-17
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Granted: 1953-06-16
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Expires: 1969-11-17
Abstract
No abstract record available.
Inventors
- 👤 Duschinsky Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:55
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
THE PROCESS WHICH COMPRISES REACTING BY HEATING 4,4-DIPHENYL-2,5-OXAZOLIDINEDIONE WITH A MEMBER OF THE GROUP CONSISTING OF A LOWER ALKANOL, A LOWER ALKANETHIOL, A LOWER TERTIARYAMINOALKANOL, AND A LOWER TERTIARYAMINOALKANETHIOL IN THE PRESENCE OF AN HYDROGEN HALIDE TO FORM THE CORRESPONDING A - AMINO-A,A-DIPHENYLACETIC ACID ESTER HYDROHALIDES AND A-AMINO-A,A-DIPHENYLTHIOACETIC ACID ESTER HYDROHALIDES, SAID TERTIARYAMINOALKANOL AND TERTIARYAMINOALKANETHIOL BEING REPRESENTED BY THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
61 words
THE PROCESS WHICH COMPRISES REACTING BY HEATING 4,4-DIPHENYL-2,5-OXAZOLIDINEDIONE WITH A MEMBER OF THE GROUP CONSISTING OF A LOWER ALKANOL, A LOWER ALKANETHIOL, A LOWER TERTIARYAMINOALKANOL, AND A LOWER TERTIARYAMINOALKANETHIOL IN THE PRESENCE OF AN HYDROGEN HALIDE TO FORM THE CORRESPONDING A - AMINO-A,A-DIPHENYLACETIC ACID ESTER HYDROHALIDES AND A-AMINO-A,A-DIPHENYLTHIOACETIC ACID ESTER HYDROHALIDES, SAID TERTIARYAMINOALKANOL AND TERTIARYAMINOALKANETHIOL BEING REPRESENTED BY THE FOLLOWING FORMULA:
Claim 3
Dependent Claim
29 words
A COMPOUND OF THE GROUP CONSISTING OF A TETRIARYAMINOALKYL ESTER AND THE SALTS THEREOF WHICH IN THE FORM OF THE FREE BASE CAN BE REPRESENTED BY THE FOLLOWING FORMULA:
Claim 4
Dependent Claim
29 words
A COMPOUND OF THE GROUP CONSISTING OF A TETRIARYAMINOALKYL ESTER AND THE SALTS THEREOF WHICH IN THE FORM OF THE FREE BASE CAN BE REPRESENTED BY THE FOLLOWING FORMULA:
References Cited (Backward Citations)
DK65376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |