US3816975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrocarbon feedstocks
Assignee: Union Carbide Corp
•
Filing: 1972-11-14
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Granted: 1974-06-18
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Expires: 1992-11-14
Abstract
Abstract Olefin - containing paraffin feedstocks are dehydrated and desulfurized by a selective adsorption process in the liquid phase using large pore zeolitic molecular sieves. Coking of the adsorbent is prevented by avoiding contact of the olefin with a sorbate - free adsorbent and desorbing olefin from the adsorbent by displacement with water.
Inventors
- 👤 J Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:23
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |