US3037046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzocaine process
Assignee: Abbott Laboratories
•
Filing: 1958-10-24
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Granted: 1962-05-29
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Expires: 1978-10-24
Abstract
No abstract record available.
Inventors
- 👤 Jr George M Illich
- 👤 Ralph M Robinson
- 👤 William D Smart
- 👤 Floyd C Garven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:04
CPC Classifications
C; C07; C07C; C07C227/00; C07C227/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN THE METHOD OF PREPARING BENZOCAINE BY ESTERIFYING P-NITROBENZOIC ACID WITH ETHYL ALCOHOL, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF CONDUCTING THE ESTERIFICATION IN AN INERT, WATER-IMMISCIBLE SOLVENT, WASHING THE SOLVENT MIXTURE CONTAINING THE RESULTING ETHYL P-NITROBENZOATE SUCCESSIVELY WITH WATER AND AN AQUEOUS ALKALINE SOLUTION, CATALYTICALLY REDUCING THE PURIFIED ETHYL P-NITROBENZOATE DIRECTLY IN THE SOLVENT MIXTURE AT A TEMPERATURE OF FROM 50* TO 65*C. AND THEREAFTER COOLING THE SOLVENT MIXTURE TO ABOUT ROOM TEMPERATURE TO PRECIPITATE THE BENZOCAINE.
Claim 2
Dependent Claim
78 words
IN THE METHOD OF PREPARING BENZOCAINE BY ESTERIFYING P-NITROBENZOIC ACID WITH ETHYL ALCOHOL, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF CONDUCTING THE ESTERIFICATION IN AN INERT, WATER-IMMISCIBLE SOLVENT, WASHING THE SOLVENT MIXTURE CONTAINING THE RESULTING ETHYL P-NITROBENZOATE SUCCESSIVELY WITH WATER AND AN AQUEOUS ALKALINE SOLUTION, CATALYTICALLY REDUCING THE PURIFIED ETHYL P-NITROBENZOATE DIRECTLY IN THE SOLVENT MIXTURE AT A TEMPERATURE OF FROM 50* TO 65*C. AND THEREAFTER COOLING THE SOLVENT MIXTURE TO ABOUT ROOM TEMPERATURE TO PRECIPITATE THE BENZOCAINE.
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) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |