US3803147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of bipyridylium salts and related compounds
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-10-26
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Granted: 1974-04-09
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Expires: 1992-10-26
Abstract
Abstract THIS INVENTION RELATES TO THE MANUFACTURE OF BIPYRIDYLIUM SALTS AND RELATED COMPOUNDS AND PARTICULARLY TO A PROCESS FOR THE MANUFACTURE OF 1,2-DISUBSTITUTED BIPYRIDYLIUM SALTS WHICH ARE USEFUL HERBICIDES.
Inventors
- 👤 J Cairns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:36
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/22; C07D211/00; C07D211/04; C07D211/80; C07D211/82; C07D471/00; C07D471/12; C07D471/14
Claims Analysis
Total Claims: 0
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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) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |