Patent US2583774A successfully refreshed from Google Patents.
US2583774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitamin b6 derivatives
Assignee: Merck and Co Inc
•
Filing: 1948-04-30
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Granted: 1952-01-29
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Expires: 1968-04-30
Abstract
No abstract record available.
Inventors
- 👤 Hoffman Dorothea Heyl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:11
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/81; C07D213/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
2-METHYL-3-HYDROXY-4-CYANO - 5 - ACETOXYMETHYLPYRIDINE.
Claim 2
Dependent Claim
5 words
2-METHYL-3-HYDROXY-4-CYANO - 5 - ACETOXYMETHYLPYRIDINE.
References Cited (Backward Citations)
US2455259A
Cited
US2455651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-28 | 1955-07-30 | 1956-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-28 | 1959-07-30 | 1960-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-28 | 1963-07-30 | 1964-01-29 | $7700.00 | Window Closed / Lapsed |