US2845428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of pyridine
Assignee: —
•
Filing: —
•
Granted: 1958-07-29
•
Expires: 1975-07-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:21
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/803
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
PROCESS FOR THE MANUFACTURE OF A PYRIDINE CARBOXYLIC ACID, WHICH COMPRISES PASSING A MIXTURE OF AIR AND A HOMOLOG OF PYRIDINE OVER A VANDIUM PENTOXIDE CATALYST SUPPORTED ON SILICA GEL AND CONTAINING AS NON-VOLATILE ACIDIC ACTIVATOR A MEMBER SELECED FROM THE GROUP CONSISTING OF SULFURIC ACID, PHOSPHORIC ACID AND BISULFATES OF ALKALI-FORMING METALS, AT A TEMPERUATURE BELOW 350*C.
Claim 2
Dependent Claim
58 words
PROCESS FOR THE MANUFACTURE OF A PYRIDINE CARBOXYLIC ACID, WHICH COMPRISES PASSING A MIXTURE OF AIR AND A HOMOLOG OF PYRIDINE OVER A VANDIUM PENTOXIDE CATALYST SUPPORTED ON SILICA GEL AND CONTAINING AS NON-VOLATILE ACIDIC ACTIVATOR A MEMBER SELECED FROM THE GROUP CONSISTING OF SULFURIC ACID, PHOSPHORIC ACID AND BISULFATES OF ALKALI-FORMING METALS, AT A TEMPERUATURE BELOW 350*C.
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) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |