Patent US3568457A successfully refreshed from Google Patents.
US3568457A
Expired / Lapsed
US
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Separation of propane and propylene by distillation
Assignee: Universal Oil Products Co
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Filing: 1969-03-05
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Granted: 1971-03-09
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Expires: 1989-03-05
Abstract
Abstract PROCESS FOR SEPARATING PROPANE FROM PROPYLENE VIA FRACTIONATION MEANS INCLUDING THE USE OF A HEAT PUMP TO SUPPLY HEAT TO THE FRACTIONATOR REBOILER.
Inventors
- 👤 Terrence M Briggs
- 👤 Valentin H Segers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:14
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |