Patent US3009957A successfully refreshed from Google Patents.
US3009957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of xylene diamines
Assignee: BASF SE
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Filing: 1959-03-31
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Granted: 1961-11-21
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Expires: 1979-03-31
Abstract
No abstract record available.
Inventors
- 👤 Adam Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:15
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A METHOD FOR THE PRODUCTION OF XYLYLENE DIAMINE BY CATALYTIC HYDROGENATION OF A PHTHALODINITRILE IN THE PRESENCE OF A SOLVENT THE IMPROVEMENT OF HYDROGENATING PHTHALODINITRILE IN THE PRESENCE OF A COBALT CATALYST CONTAINING, IN ADDITION TO AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF CHROMIUM AND MANGANESE, FROM ABOUT 0.05% TO ABOUT 5% OF AN ACID SELECTED FROM THE GROUP CONSISTING OF POLYSULFURIC ACID, POLYBORIC ACID, AND POLYPHOSPHORIC ACID, SAID PERCENTAGE BEING BASED ON THE TOTAL WEIGHT OF THE CATALYST.
Claim 2
Dependent Claim
83 words
IN A METHOD FOR THE PRODUCTION OF XYLYLENE DIAMINE BY CATALYTIC HYDROGENATION OF A PHTHALODINITRILE IN THE PRESENCE OF A SOLVENT THE IMPROVEMENT OF HYDROGENATING PHTHALODINITRILE IN THE PRESENCE OF A COBALT CATALYST CONTAINING, IN ADDITION TO AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF CHROMIUM AND MANGANESE, FROM ABOUT 0.05% TO ABOUT 5% OF AN ACID SELECTED FROM THE GROUP CONSISTING OF POLYSULFURIC ACID, POLYBORIC ACID, AND POLYPHOSPHORIC ACID, SAID PERCENTAGE BEING BASED ON THE TOTAL WEIGHT OF THE CATALYST.
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) | 1964-11-20 | 1965-05-22 | 1965-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-20 | 1969-05-22 | 1969-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-20 | 1973-05-22 | 1973-11-21 | $7700.00 | Window Closed / Lapsed |