US3462348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of isophorone by plural stage distillation
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1968-03-25
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Granted: 1969-08-19
•
Expires: 1988-03-25
Abstract
No abstract record available.
Inventors
- 👤 William E Wellman
- 👤 Paul E Burton
- 👤 William D Diana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:04
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/82; C07C45/61; C07C45/67; C07C45/85
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3031384A
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US3337423A
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US3337632A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-18 | 1973-02-17 | 1973-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-18 | 1977-02-17 | 1977-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-18 | 1981-02-17 | 1981-08-19 | $7700.00 | Window Closed / Lapsed |