Patent US3775302A successfully refreshed from Google Patents.
US3775302A
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US
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Prevention of efflux of hydrodesulfurization catalyst particles
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1971-12-22
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Granted: 1973-11-27
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Expires: 1991-12-22
Abstract
Abstract IN A METHOD FOR CATALYTIC HYDRODESULFURIZATION OF A HEAVY PETROLEUM HYDROCARBON OIL IN A REACTOR COMPOSED OF A CYLINDRICAL PRESSURE VESSEL AND A CYLINDRICAL INNER PIPE, IN WHICH HYDROGEN GAS, OIL LIQUID AND SOLID CATALYST PARTICLES ARE CONCURRENTLY PRESENT AND THE CATALYST PARTICLES ARE FLUIDIZED AND RECYCLED IN THE REACTOR WITHOUT FLOWING OUT OF THE REACTOR, AN IMPROVEMENT FOR THE PREVENTION OF THE CATALYST''S EFFLUX IS ACHIEVED BY THE PROVI- SION OF A BUBBLE-COLLECTING PLATE AND A CATALYST PARTICLESCATCHING PLATE ABOVE THE INNER PIPE IN THE REACTOR.
Inventors
- 👤 J Kubo
- 👤 Y Koiwai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:37
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/14; C10G45/16; B; B01; B01J; B01J8/00; B01J8/18; B01J8/20; B01J8/22; B01J8/224; B01J8/226
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |