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US2983493A
Expired / Lapsed
US
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Fractionating column with stepped trays
Assignee: Cyprus Amax Minerals Co
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Filing: 1958-03-03
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Granted: 1961-05-09
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Expires: 1978-03-03
Abstract
No abstract record available.
Inventors
- 👤 Erwin C Handwerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:55
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/04; C22B19/16; B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/24; C22B19/18; C22B5/00; C22B5/02; C22B5/16
Claims Analysis
Total Claims: 0
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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) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |