Patent US1545203A successfully refreshed from Google Patents.
Patent US2591415A successfully refreshed from Google Patents.
US2591415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of aromatic nitriles
Assignee: Bayer AG
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Filing: 1949-07-12
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Granted: 1952-04-01
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Expires: 1969-07-12
Abstract
No abstract record available.
Inventors
- 👤 Engelhardt Rudolf
- 👤 Arledter Hanns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:39
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A PROCESS FOR THE MANUFACTURE OF AN AROMATIC NITRILE, WHICH COMPRISES REACTING IN THE VAPOR PHASE A NUCLEAR HALOGENATED AROMATIC COMPOUND WITH HYDROGEN CYANIDE AT A TEMPERATURE OF BETWEEN ABOUT 400 AND ABOUT 1000* C. IN THE PRESENCE OF A METALLIC CATALYST CONTAINING AT LEAST ONE METAL OF THE EMPIRICAL GROUP CONSISTING OF COPPER AND SILVER.
Claim 2
Dependent Claim
56 words
A PROCESS FOR THE MANUFACTURE OF AN AROMATIC NITRILE, WHICH COMPRISES REACTING IN THE VAPOR PHASE A NUCLEAR HALOGENATED AROMATIC COMPOUND WITH HYDROGEN CYANIDE AT A TEMPERATURE OF BETWEEN ABOUT 400 AND ABOUT 1000* C. IN THE PRESENCE OF A METALLIC CATALYST CONTAINING AT LEAST ONE METAL OF THE EMPIRICAL GROUP CONSISTING OF COPPER AND SILVER.
References Cited (Backward Citations)
US1672253A
Cited
US2477672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |