The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2002
Filed:
Feb. 05, 2001
Nihon Kohden Corporation, Tokyo, JP;
Abstract
The conduit tube and the conduit tube to flow the carrier solution to the gas exchanger are provided, and in the conduit tube , the reference pH electrode is provided, and in the conduit tube , the measuring pH electrode is provided, both pH electrodes preferably being chosen of the ISFET type (Ion-Sensitive Field-Effect-Transistor). The gas exchanger is partitioned from the outside by the gas permeable membrane . Initially, the gas exchange section is inserted into the test substance, and next, the carrier solution is flowed at the speed of a degree in which the gas exchange is not conducted in the gas exchanger . The output potential difference &Dgr;V(0) between the reference pH electrode and the measuring pH electrode at this time, is found. Next, the carrier solution is slowly flowed at a predetermined speed, so that the gas exchange is fully conducted in the gas exchanger , the output potential difference &Dgr;V(t) between the reference pH electrode and the measuring pH electrode at time t is found, and the difference &Dgr;&Dgr;V(t) between the &Dgr;V(t) measured at this time and the &Dgr;V(0)obtained at the last time, is obtained. This value corresponds to the correct gas partial pressure change.