Patent US2553405A successfully refreshed from Google Patents.
US2553405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of benzonitriles
Assignee: Wyeth Holdings LLC
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Filing: 1950-04-08
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Granted: 1951-05-15
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Expires: 1970-04-08
Abstract
No abstract record available.
Inventors
- 👤 James K Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:20
CPC Classifications
C; C07; C07C; C07C255/00; C07C255/49
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
THE METHOD OF PREPARING A BENZONITRILE THAT COMPRISES HEATING A MEMBER OF THE GROUP CONSISTING OF BENZENE AND A HALOBENZENE WITH A CYANOGEN HALIDE OF THE GROUP CONSISTING OF CYANOGEN CHLORIDE AND CYANOGEN BROMIDE AT A TEMPERATURE OF AT LEAST 600* C., AND RECOVERING THE THUS-FORMED BENZONITRILE.
Claim 2
Independent Claim
47 words
THE METHOD OF PREPARING A BENZONITRILE THAT COMPRISES HEATING A MEMBER OF THE GROUP CONSISTING OF BENZENE AND A HALOBENZENE WITH A CYANOGEN HALIDE OF THE GROUP CONSISTING OF CYANOGEN CHLORIDE AND CYANOGEN BROMIDE AT A TEMPERATURE OF AT LEAST 600* C., AND RECOVERING THE THUS-FORMED BENZONITRILE.
References Cited (Backward Citations)
US2449643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |