US2932665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of nu, nu-diethyltoluamides
Assignee: Hercules Powder Co
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Filing: 1957-12-30
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Granted: 1960-04-12
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Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 Romeo B Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:21
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A CONTINUOUS, VAPOR-PHASE PROCESS FOR THE PREPARATION OF N,N-DIETHYLTOLUAMIDE WHICH COMPRISES CONTINUOUSLY INTRODUCING DIETHYLAMINE AND TOLUIC ACID, IN A MOLAR RATIO OF AMINE TO ACID BETWEEN ABOUT 2:1 AND ABOUT 6:1, INTO A REACTION ZONE CONTAINING A CATALYST SELECTED FROM THE GROUP CONISTING OF SILICA GEL AND ALUMINA, PASSING SAID AMINE AND SAID ACID IN INTIMATE CONTACT WITH EACH OTHER OVER SAID CATALYST AT A RATE CORRESPONDING TO A CONTACT TIME OF UP TO ABOUT 2 MINUTES, THE TEMPERATURE BEING IN THE RANGE OF 250* TO 350*C., CONTINUOUSLY REMOVING THE VAPORIZED AMIDE FROM SAID REACTION ZONE AND CONDENSING SAID AMIDE.
Claim 2
Dependent Claim
100 words
A CONTINUOUS, VAPOR-PHASE PROCESS FOR THE PREPARATION OF N,N-DIETHYLTOLUAMIDE WHICH COMPRISES CONTINUOUSLY INTRODUCING DIETHYLAMINE AND TOLUIC ACID, IN A MOLAR RATIO OF AMINE TO ACID BETWEEN ABOUT 2:1 AND ABOUT 6:1, INTO A REACTION ZONE CONTAINING A CATALYST SELECTED FROM THE GROUP CONISTING OF SILICA GEL AND ALUMINA, PASSING SAID AMINE AND SAID ACID IN INTIMATE CONTACT WITH EACH OTHER OVER SAID CATALYST AT A RATE CORRESPONDING TO A CONTACT TIME OF UP TO ABOUT 2 MINUTES, THE TEMPERATURE BEING IN THE RANGE OF 250* TO 350*C., CONTINUOUSLY REMOVING THE VAPORIZED AMIDE FROM SAID REACTION ZONE AND CONDENSING SAID AMIDE.
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) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |