Patent US2968677A successfully refreshed from Google Patents.
US2968677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of isophorone
Assignee: —
•
Filing: —
•
Granted: 1961-01-17
•
Expires: 1978-01-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:20
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PROCESS OF DECOLORIZING COLORED ISOPHORONE WHICH COMPRISES MIXING COLORED ISOPHORONE WITH AN AROMATIC SULPHONIC ACID SELECTED FROM THE GROUP CONSISTING OF TOLUENE PARA-SULPHONIC ACID AND SULPHANILIC ACID, AND DISTILLING ISOPHORONE FROM THE MIXTURE
Claim 2
Dependent Claim
34 words
A PROCESS OF DECOLORIZING COLORED ISOPHORONE WHICH COMPRISES MIXING COLORED ISOPHORONE WITH AN AROMATIC SULPHONIC ACID SELECTED FROM THE GROUP CONSISTING OF TOLUENE PARA-SULPHONIC ACID AND SULPHANILIC ACID, AND DISTILLING ISOPHORONE FROM THE MIXTURE
References Cited (Backward Citations)
US2399976A
Cited
US2465475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |