Patent US2540218A successfully refreshed from Google Patents.
US2540218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-hydroxy-pyridine-n-oxide and process for preparing same
Assignee: ER Squibb and Sons LLC
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Filing: 1947-08-25
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Granted: 1951-02-06
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Expires: 1967-08-25
Abstract
No abstract record available.
Inventors
- 👤 Elliott N Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:44
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/89
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
AN N-OXIDE OF A PYRIDINE HAVING IN THE 2-POSITION A MEMBER OF THE CLASS CONSISTING OF HYDROXY AND ALKOXY GROUPS.
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) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |