US2503280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo catalysts in preparation of sulfonic acids
Assignee: EIDP Inc
•
Filing: 1947-10-24
•
Granted: 1950-04-11
•
Expires: 1967-10-24
Abstract
No abstract record available.
Inventors
- 👤 Lockwood William Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:00
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/02; C07C303/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN THE PREPARATION OF A SULFONIC ACID FROM SULFUR DIOXIDE, OXYGEN, AND A HYDROCARBON OF THE CLASS CONSISTING OF SATURATED ALIPHATIC HYDROCARBONS AND SATURATED CYCLOALIPHATIC HYDROCARBONS THE IMPROVEMENT WHEREIN THE SULFUR DIOXIDE, OXYGEN, AND HYDROCARBON ARE BROUGHT INTO CONTACT WITH EACH OTHER AND A CATALYST OF THE CLASS CONSISTING OF ALPHA,ALPHA''-AZOBIS(CYANOALKANES) WHEREIN THE CYANO GROUP OF THE CYANOALKYL RADICAL IS ATTACHED TO TERTIARY CARBON WHICH IS ATTACHED TO AZO NITROGEN AND ALPHA,ALPHA''-AZOBIS(CYANOCYCLOALKANES) WHEREIN THE CYANO GROUP OF THE CYANOCYCLOALKY RADICAL IS ATTACHED TO TERTIARY CARBON WHICH IS ATTACHED TO AZO NITROGEN.
Claim 2
Dependent Claim
91 words
IN THE PREPARATION OF A SULFONIC ACID FROM SULFUR DIOXIDE, OXYGEN, AND A HYDROCARBON OF THE CLASS CONSISTING OF SATURATED ALIPHATIC HYDROCARBONS AND SATURATED CYCLOALIPHATIC HYDROCARBONS THE IMPROVEMENT WHEREIN THE SULFUR DIOXIDE, OXYGEN, AND HYDROCARBON ARE BROUGHT INTO CONTACT WITH EACH OTHER AND A CATALYST OF THE CLASS CONSISTING OF ALPHA,ALPHA''-AZOBIS(CYANOALKANES) WHEREIN THE CYANO GROUP OF THE CYANOALKYL RADICAL IS ATTACHED TO TERTIARY CARBON WHICH IS ATTACHED TO AZO NITROGEN AND ALPHA,ALPHA''-AZOBIS(CYANOCYCLOALKANES) WHEREIN THE CYANO GROUP OF THE CYANOCYCLOALKY RADICAL IS ATTACHED TO TERTIARY CARBON WHICH IS ATTACHED TO AZO NITROGEN.
References Cited (Backward Citations)
DE735096C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |