Patent US2962502A successfully refreshed from Google Patents.
US2962502A
Expired / Lapsed
US
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Preparation of 2, 2'-bipyridyl
Assignee: Imperial Chemical Industries Ltd
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Filing: 1959-01-05
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Granted: 1960-11-29
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Expires: 1979-01-05
Abstract
No abstract record available.
Inventors
- 👤 Freeman Peter Frank Hilary
- 👤 Ghosh Ranajit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:49
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
PROCESS FOR THE MANUFACTURE OF 2:2''-BIPYRIDYL WHICH COMPRISES HEATING PYRIDINE WITH FERROUS CHLORIDE AT SUPERATMOSPHERIC PRESSURE AND A TEMPERATURE BETWEEN ABOUT 250*C. AND 350*C., WHEREBY SAID PYRIDINE IS OXIDIZED TO 2:2''-DIPYRIDYL, THE FERROUS CHLORIDE CONSTITUING THE SOLE ESSENTIAL OXIDIZING AGENT.
Claim 2
Dependent Claim
40 words
PROCESS FOR THE MANUFACTURE OF 2:2''-BIPYRIDYL WHICH COMPRISES HEATING PYRIDINE WITH FERROUS CHLORIDE AT SUPERATMOSPHERIC PRESSURE AND A TEMPERATURE BETWEEN ABOUT 250*C. AND 350*C., WHEREBY SAID PYRIDINE IS OXIDIZED TO 2:2''-DIPYRIDYL, THE FERROUS CHLORIDE CONSTITUING THE SOLE ESSENTIAL OXIDIZING AGENT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |