US3041378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of isophorone
Assignee: —
•
Filing: —
•
Granted: 1962-06-26
•
Expires: 1979-06-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:28
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C45/00; C07C45/78; C07C45/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A PROCESS OF DECOLORIZING CRUDE ISOPHORONE COMPRISING CONTACTING THE ISOPHORONE WITH AN ACID TYPE OF FULLER''S EARTH AT A TEMPERATURE IN THE RANGE FROM 90* TO 150*C. AND DISTILLING TO RECOVER ISOPHORONE.
Claim 2
Dependent Claim
32 words
A PROCESS OF DECOLORIZING CRUDE ISOPHORONE COMPRISING CONTACTING THE ISOPHORONE WITH AN ACID TYPE OF FULLER''S EARTH AT A TEMPERATURE IN THE RANGE FROM 90* TO 150*C. AND DISTILLING TO RECOVER ISOPHORONE.
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) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |