US4517053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sampling paper pulp liquor
Assignee: Individual
•
Filing: 1982-11-08
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Granted: 1985-05-14
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Expires: 2002-11-08
Abstract
Abstract In a paper making process the liquid fraction of wood pulp stock liquor is sampled between the bleaching and caustic extraction stages and after caustic introduction to regulate the amount of caustic introduced into the pulp stock liquor. A particular sampling device with a lower pressure chamber extracts that stock liquor from the periphery of a higher pressure pipe and passes the sample to previously known continuous testing apparatus. A particular double screen type interfacing joins the sampling device and pulp stock to allow liquor extraction without excessive wear or plugging of the interface.
Inventors
- 👤 James B. Devine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:38
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/34; G01N33/343; B; B01; B01D; B01D35/00; B01D35/22; D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
Apparatus for withdrawing a sample of the liquid fraction of paper pulp stock from the periphery of a conduit carrying such stock under pressure above the pressure of the ambient atmosphere comprising, in combination: a sampler having a peripherally defined extraction chamber carried externally of the conduit with a permeable member forming an interface between the interior member comprising a plate and screen joined at their edges by a rigid frame substantially the same size and configuration as the interface and the thickness of the screen and the plate being substantially the same as the thickness of the conduit wall, and wherein the frame containing the permeable member is sealed to the conduit and sampler so that the outer surface of the screen is coincident with the inner surface of the conduit; valve means for adjustably regulating the pressure in the sampler chamber between that of the pulp stock and that of the ambient atmosphere; and conduit means for removing the liquid fraction in the sampler chamber for subsequent testing.
Claim 2
Dependent Claim
170 words
Apparatus for withdrawing a sample of the liquid fraction of paper pulp stock from the periphery of a conduit carrying such stock under pressure above the pressure of the ambient atmosphere comprising, in combination: a sampler having a peripherally defined extraction chamber carried externally of the conduit with a permeable member forming an interface between the interior member comprising a plate and screen joined at their edges by a rigid frame substantially the same size and configuration as the interface and the thickness of the screen and the plate being substantially the same as the thickness of the conduit wall, and wherein the frame containing the permeable member is sealed to the conduit and sampler so that the outer surface of the screen is coincident with the inner surface of the conduit; valve means for adjustably regulating the pressure in the sampler chamber between that of the pulp stock and that of the ambient atmosphere; and conduit means for removing the liquid fraction in the sampler chamber for subsequent testing.
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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |