Patent US3272835A successfully refreshed from Google Patents.
US3272835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of bipyridyls
Assignee: —
•
Filing: —
•
Granted: 1966-09-13
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Expires: 1983-09-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:03
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
IN A PROCESS FOR THE MANUFACTURE OF A BIPYRIDYL BY REACTION OF A METAL SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS AND CALCIUM AND A PYRIDINE TO FORM A METAL-PYRIDINE INTERACTION PRODUCT AND OXIDIZING SAID INTERACTION PRODUCT TO BIPYRIDYL, THE IMPROVEMENT WHICH COMPRISES USING A SOLUTION OF SAID METAL IN LIQUID AMMONIA FOR REACTION WITH THE PYRIDINE TO FORM SAID INTERACTION PRODUCT.
Claim 2
Dependent Claim
63 words
IN A PROCESS FOR THE MANUFACTURE OF A BIPYRIDYL BY REACTION OF A METAL SELECTED FROM THE GROUP CONSISTING OF ALKALI METALS AND CALCIUM AND A PYRIDINE TO FORM A METAL-PYRIDINE INTERACTION PRODUCT AND OXIDIZING SAID INTERACTION PRODUCT TO BIPYRIDYL, THE IMPROVEMENT WHICH COMPRISES USING A SOLUTION OF SAID METAL IN LIQUID AMMONIA FOR REACTION WITH THE PYRIDINE TO FORM SAID INTERACTION PRODUCT.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |