US3045995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heated fractionating column
Assignee: Cyprus Amax Minerals Co
•
Filing: 1957-09-26
•
Granted: 1962-07-24
•
Expires: 1977-09-26
Abstract
No abstract record available.
Inventors
- 👤 Erwin C Handwerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:32
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/04; C22B19/16; B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/18; B01D3/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2475481A
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US2715607A
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US2670196A
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US2694675A
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US2983493A
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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) | 1965-07-23 | 1966-01-22 | 1966-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-23 | 1970-01-22 | 1970-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-23 | 1974-01-22 | 1974-07-24 | $7700.00 | Window Closed / Lapsed |