US3634535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation and catalysis
Assignee: Chevron USA Inc
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Filing: 1969-08-22
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Granted: 1972-01-11
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Expires: 1989-08-22
Abstract
Abstract A PROCESS FOR SEPARATING A FIRST CHEMICAL FROM A MIXTURE OF CHEMICALS USING TWO DISTILLATION COLUMN REACTORS IN SERIES. IN THE FIRST DISTILLATION COLUMN REACTOR THE FIRST CHEMICAL UNDERGOES A REACTION TO FORM A SECOND CHEMICAL WHICH IS EASILY FRACTIONATED FROM THE MIXTURE OF CHEMICALS. THIS SECOND CHEMICAL IS THEN FED TO THE SECOND DISTILLATION COLUMN REACTOR, WHERE THE REACTION IS REVERSED AND THE FIRST CHEMICAL IS RECOVERED BY FRACTIONATION.
Inventors
- 👤 Willard M Haunschild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:18
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/32; B01D3/322; B01D3/009; B01D3/143; B01D3/146; C; C07; C07C; C07C7/00; C07C7/148; C07C7/14875; C07C7/14891; Y; Y02; Y02P; Y02P20/00; Y02P20/10
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |