US3205265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of diphenylamine
Assignee: Bayer AG
•
Filing: 1962-03-16
•
Granted: 1965-09-07
•
Expires: 1982-03-16
Abstract
No abstract record available.
Inventors
- 👤 Danziger Harry
- 👤 Kersting Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:02
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/64; B; B01; B01J; B01J21/00; B01J21/02; B01J27/00; B01J27/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A PROCESS FOR THE PRODUCTION OF DIPHENYLAMINE BY HEATING ANILINE UNDER PRESSURE IN THE LIQUID PHASE, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE REACTION IN THE PRESENCE OF A CATALYST CONSISTING OF A MIXTURE OF A HALOGEN OF THE GROUP CONSISTING OF CHLORINE, BROMINE AND IODINE, AND AN OXYGEN-CONTAINING PHOSPHORUS COMPOUND OF THE GROUP CONSISTING OF PHOSPHORUS TRIOXIDE, PHOSPHORUS PENTOXIDE, PHOSPHOROUS ACID, PHOSPHORIC ACID, AND BORON PHOSPHATE IN A RATIO BETWEEN APPROXIMATELY 0.5 AND APPROXIMATELY 2 PARTS BY WEIGHT OF THE PHOSPHORUS COMPOUND TO EACH PART BY WEIGHT OF THE HALOGEN AND IN AN AMOUNT BETWEEN APPROXIMATELY 0.1 AND APPROXIMATELY 0.5 PERCENT BY WEIGHT OF THE ANILINE.
Claim 2
Dependent Claim
107 words
IN A PROCESS FOR THE PRODUCTION OF DIPHENYLAMINE BY HEATING ANILINE UNDER PRESSURE IN THE LIQUID PHASE, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE REACTION IN THE PRESENCE OF A CATALYST CONSISTING OF A MIXTURE OF A HALOGEN OF THE GROUP CONSISTING OF CHLORINE, BROMINE AND IODINE, AND AN OXYGEN-CONTAINING PHOSPHORUS COMPOUND OF THE GROUP CONSISTING OF PHOSPHORUS TRIOXIDE, PHOSPHORUS PENTOXIDE, PHOSPHOROUS ACID, PHOSPHORIC ACID, AND BORON PHOSPHATE IN A RATIO BETWEEN APPROXIMATELY 0.5 AND APPROXIMATELY 2 PARTS BY WEIGHT OF THE PHOSPHORUS COMPOUND TO EACH PART BY WEIGHT OF THE HALOGEN AND IN AN AMOUNT BETWEEN APPROXIMATELY 0.1 AND APPROXIMATELY 0.5 PERCENT BY WEIGHT OF THE ANILINE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |