Measuring and testing – Measuring vessel
Patent
1976-08-26
1977-12-20
Richman, Barry S.
Measuring and testing
Measuring vessel
23230B, 23259, 23292, 128 2F, 128 2G, 141 8, 141 65, B01L 314, B65B 3108, G01N 114, G01N 3316
Patent
active
040634604
ABSTRACT:
A method for reducing the pressure in and then collecting medium samples in containers such as test tubes sealed by a resilient stopper at substantially atmospheric pressure, comprising piercing the stopper at or shortly before the time of collection of a medium sample by a first cannula, connected at one end to a pressure-reducing device, thereby connecting the interior of the container with the pressure-reducing device via the first cannula; evacuating the container to a desired subatmospheric pressure; withdrawing the first cannula; penetrating the stopper by a second cannula connected at one end to a medium source to be sampled, thereby connecting the source with the interior of the container via the second cannula; and then sucking a sample of medium into the container under the influence of the subatmospheric pressure effected in the interior of the container by the pressure reduction.
REFERENCES:
patent: 3113688 (1963-12-01), Campbell
patent: 3433216 (1969-03-01), Mattson
patent: 3469572 (1969-03-01), Nehring
patent: 3494352 (1970-02-01), Russo et al.
patent: 3500821 (1970-03-01), Ogle
patent: 3503386 (1970-03-01), Pieratt
patent: 3776218 (1973-02-01), Svensson
Marcus Michael S.
Richman Barry S.
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