Patent US2766252A successfully refreshed from Google Patents.
US2766252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters of nicotinic acid
Assignee: ENDO LAB
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Filing: 1955-01-24
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Granted: 1956-10-09
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Expires: 1975-01-24
Abstract
No abstract record available.
Inventors
- 👤 Schlesinger Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:42
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
COMPOUNDS OF THE GROUP CONSISTING OF PYRIDINE-3CARBOXYLIC ACID ESTERS OF DIBENZYLAMINO ALKANOLS HAVING THE STRUCTURE:
Claim 2
Dependent Claim
15 words
COMPOUNDS OF THE GROUP CONSISTING OF PYRIDINE-3CARBOXYLIC ACID ESTERS OF DIBENZYLAMINO ALKANOLS HAVING THE STRUCTURE:
References Cited (Backward Citations)
DE743467C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-09 | 1960-04-09 | 1960-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-09 | 1964-04-09 | 1964-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-09 | 1968-04-09 | 1968-10-09 | $7700.00 | Window Closed / Lapsed |