Patent US4643878A successfully refreshed from Google Patents.
US4643878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction cell
Assignee: WestRock Minnesota Corp
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Filing: 1984-10-18
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Granted: 1987-02-17
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Expires: 2004-10-18
Abstract
Abstract A toxic substance extraction cell includes a chamber for housing a heated solvent, a pair of gaskets adapted to be seated on the solvent housing between which is clamped a specimen to be tested; the space between the gaskets being liquid tight, and a cover for clamping the gaskets to the solvent housing. After assembly of the cell with the preheated solvent in the housing and the specimen to be tested between the gaskets, the cell is inverted and supported on a plurality of legs provided on the cover. The solvent is thus placed in contact with the specimen in order to dissolve any toxic substances contained within the specimen. The cell is then reinverted and supported on a suitable stand and allowed to cool, disassembled, and the solvent removed and tested for toxic residue.
Inventors
- 👤 George M. Seiter
- 👤 Loren J. Klitzke
- 👤 Iver L. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:51
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0215; G; G01; G01N; G01N1/00; G01N1/28; Y; Y10; Y10T; Y10T436/00; Y10T436/25; Y10T436/25375; Y10T436/255
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
230 words
An extraction cell for testing the toxicity in a specimen housed within the cell by enabling it to contact a suitable solvent adapted to dissolve any toxic substances in the specimen, comprising: a housing adapted to receive a quantity of said solvent, said housing including a centrally located opening and a rigidly-affixed flange; a plurality of pins having at least one threaded end extending upwardly from the flange of said solvent housing; at least one gasket member having a centrally located specimen exposure opening adapted to be placed in registration with the centrally located opening in said solvent housing and including a plurality of pin openings extending about the circumference thereof adapted to receive the pins extending upwardly from said solvent housing flange therethrough; and a cover element adapted to clamp a specimen placed over the specimen exposure opening in said gasket to said solvent housing in liquid-tight sealed engagement against the flange of the housing, said cover including a plurality of pin openings extending about its circumference adapted to receive the upright pins on said solvent housing therethrough, means received on the threaded end of said pins for clamping said cover, gasket and a specimen to be tested to said solvent housing in liquid-tight sealed engagement, and support means on said cover element for supporting said extraction cell in an inverted position in which the solvent contacts the specimen.
Claim 2
Dependent Claim
230 words
An extraction cell for testing the toxicity in a specimen housed within the cell by enabling it to contact a suitable solvent adapted to dissolve any toxic substances in the specimen, comprising: a housing adapted to receive a quantity of said solvent, said housing including a centrally located opening and a rigidly-affixed flange; a plurality of pins having at least one threaded end extending upwardly from the flange of said solvent housing; at least one gasket member having a centrally located specimen exposure opening adapted to be placed in registration with the centrally located opening in said solvent housing and including a plurality of pin openings extending about the circumference thereof adapted to receive the pins extending upwardly from said solvent housing flange therethrough; and a cover element adapted to clamp a specimen placed over the specimen exposure opening in said gasket to said solvent housing in liquid-tight sealed engagement against the flange of the housing, said cover including a plurality of pin openings extending about its circumference adapted to receive the upright pins on said solvent housing therethrough, means received on the threaded end of said pins for clamping said cover, gasket and a specimen to be tested to said solvent housing in liquid-tight sealed engagement, and support means on said cover element for supporting said extraction cell in an inverted position in which the solvent contacts the specimen.
Claim 3
Dependent Claim
28 words
The extraction cell of claim 1 wherein said support means on said cover includes a plurality of studs extending upwardly from the outer surface of said cover element.
Claim 4
Dependent Claim
47 words
The extraction cell of claim 1 including a second gasket between said cover and said first gasket for aiding in providing a liquid-tight seal adjacent the outer periphery of said extraction cell, said second gasket including a plurality of openings adjacent its periphery receiving said pins therethrough.
Claim 5
Dependent Claim
23 words
The extraction cell of claim 1 including a stand connected to said solvent housing for supporting said extraction cell in an upright position.
Claim 6
Dependent Claim
23 words
The extraction cell of claim 3 including a stand connected to said solvent housing for supporting said extraction cell in an upright position.
Claim 7
Dependent Claim
24 words
The extraction cell of claim 2 including a bar extending between a pair of said studs to provide a hold for raising said cover.
Claim 8
Dependent Claim
39 words
The extraction cell of claim 1 wherein the specimen is a substantially planar piece of sheet material and the centrally located opening in the housing and centrally located specimen exposure opening are slightly smaller in area than the specimen.
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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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |