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Patent US3049547A successfully refreshed from Google Patents.
US3049547A
Expired / Lapsed
US
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Dipyridyl quaternary salts
Assignee: Reilly Tar and Chemical Corp
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Filing: 1961-05-31
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Granted: 1962-08-14
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Expires: 1981-05-31
Abstract
No abstract record available.
Inventors
- 👤 Francis E Cislak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:27
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
THE DIPRIDYL QUATERNARY SALTS HAVING THE FORMULA:
Claim 2
Dependent Claim
7 words
THE DIPRIDYL QUATERNARY SALTS HAVING THE FORMULA:
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) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |