US2721202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of pure
Assignee: —
•
Filing: —
•
Granted: 1955-10-18
•
Expires: 1972-10-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:17
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/803; A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/435; A61K31/44; A61K31/455
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR THE MANUFACTURE OF PURE NICOTINIC ACID WHICH COMPRISES SUBJECTING A MIXTURE OF A NICOTINIC ACID CONTAINING COMPOSITION WITH AN INERT SOLVENT SELECTED FROM THE GROUP CONSISTING OF TETRALIN, DIPHENYL AND DIPHENYL ETHER TO AZEOTROPIC DISTILLATION.
Claim 2
Dependent Claim
38 words
A PROCESS FOR THE MANUFACTURE OF PURE NICOTINIC ACID WHICH COMPRISES SUBJECTING A MIXTURE OF A NICOTINIC ACID CONTAINING COMPOSITION WITH AN INERT SOLVENT SELECTED FROM THE GROUP CONSISTING OF TETRALIN, DIPHENYL AND DIPHENYL ETHER TO AZEOTROPIC DISTILLATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |