US3228985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifying methyl ethyl ketone
Assignee: Celanese Corp
•
Filing: 1961-12-27
•
Granted: 1966-01-11
•
Expires: 1981-12-27
Abstract
No abstract record available.
Inventors
- 👤 Carpenter Sammy
- 👤 Wallace E Taylor
- 👤 Jr William T Mcnair
- 👤 Frank T Talbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:00
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/81; C07C45/82; C07C45/83; C07C45/80; C07C45/85
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA451393A
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CA501374A
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US1542538A
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US2205184A
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US2429484A
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US2570157A
Cited
US3013081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |