Patent US3806444A successfully refreshed from Google Patents.
US3806444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desulfurization of petroleum crude
Assignee: Texaco Inc
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Filing: 1972-12-29
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Granted: 1974-04-23
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Expires: 1992-12-29
Abstract
Abstract HYDRODESULFURIZATION PROCESS TO CONVERT LARGE VOLUMES OF HIGH SULFUR OIL TO LIQUID INDUSTRIAL FUELS WITH A MAXIMUM OF 0.1% SULFUR BY WEIGHT, THEREBY MEETING STRINGENT POLLUTION CONTROL STANDARDS. IN THE PROCESS A LOW NAPHTHA HIGH SULFUR CONTAINING PETROLEUM CRUDE OR CRUDE FRACTION IS THERMALLY AND CATALYTICALLY HYDROCRACKED AD HYDROTREATED IN THE PRESENCE OF A STREAM OF SUPPLEMENTAL NAPHTHA FROM AN EXTERNAL SOURCE. H2S, CH4 AND CO2 PRODUCED IN THE PROCESS DISSOLVE IN LIQUID NAPHTHA AND ARE LATER SEPARATED IN A FRACTIONATOR WHERE NAPHTHA IS RECOVERED AND RECYCLED.
Inventors
- 👤 W Crouch
- 👤 D Jesse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:26
CPC Classifications
C; C10; C10G; C10G47/00; C10G47/22; C10G65/00; C10G65/02; C10G65/10
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |