Patent US4789293A successfully refreshed from Google Patents.
Patent US3973440A successfully refreshed from Google Patents.
US3973440A
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US
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Catalyst sampling method
Assignee: Universal Oil Products Co
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Filing: 1975-04-28
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Granted: 1976-08-10
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Expires: 1995-04-28
Abstract
Abstract Small representative samples of catalyst are removed from a fixed bed reactor through a withdrawal conduit and transferred into a sample receiver held at a lower pressure by quickly unsealing the withdrawal conduit and causing a small and sudden gas flow which fluidizes catalyst and lifts it into the withdrawal conduit, through which it falls by the action of gravity.
Inventors
- 👤 John E. Vande Ven
- 👤 Steven M. Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:51
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/10; G01N1/20; B; B01; B01J; B01J8/00; B01J8/0015; B01J8/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
A method of transferring a catalyst sample from a sampling point within a vessel containing a bed of catalyst into a withdrawal conduit having a downward-facing catalyst entrance port, and of transferring the catalyst sample into a sample receiver located outside of the vessel which comprises the steps of: a. sealing the withdrawal conduit to gas flow at a point intermediate the sampling point and the sample receiver; b. evacuating the sample receiver and creating a pressure therein lower than that maintained in the vessel; and, c. rapidly unsealing the withdrawal conduit and passing a short and rapid gas flow through the withdrawal conduit, which equalizes the pressures within the vessel and the sample receiver, and effecting a fluidization of catalyst into the entrance port of the withdrawal conduit and the transfer of catalyst through the withdrawal conduit to the sample receiver.
Claim 2
Independent Claim
142 words
A method of transferring a catalyst sample from a sampling point within a vessel containing a bed of catalyst into a withdrawal conduit having a downward-facing catalyst entrance port, and of transferring the catalyst sample into a sample receiver located outside of the vessel which comprises the steps of: a. sealing the withdrawal conduit to gas flow at a point intermediate the sampling point and the sample receiver; b. evacuating the sample receiver and creating a pressure therein lower than that maintained in the vessel; and, c. rapidly unsealing the withdrawal conduit and passing a short and rapid gas flow through the withdrawal conduit, which equalizes the pressures within the vessel and the sample receiver, and effecting a fluidization of catalyst into the entrance port of the withdrawal conduit and the transfer of catalyst through the withdrawal conduit to the sample receiver.
Claim 3
Dependent Claim
21 words
The method of claim 1 further characterized in that the pressure within the sample receiver is lowered to a subatmospheric pressure.
Claim 4
Dependent Claim
17 words
The method of claim 2 further characterized in that a portion of the withdrawal conduit is evacuated.
References Cited (Backward Citations)
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Cited
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US3442138A
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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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |