Electrolyte composition for screen printing and miniaturized oxygen electrode and production process thereof

• US 5,468,408 A
• Filed: 11/03/1993
• Issued: 11/21/1995
• Est. Priority Date: 03/20/1991
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Suzuki, Hiroaki, Sugama, Akio, Kojima, Naomi
• Primary Examiner(s): Bell, Bruce F.
• Application Number:
  US08/145,245
• Time in Patent Office: 748 Days
• Field of Search: 204/418, 204/419, 204/433, 204/435, 204/415, 204/153.17, 204/403, 252/62.2, 101/128.4, 106/20 B, 501/20
• US Class Current: 252/62.2
• CPC Class Codes: G01N 27/404 Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid , e.g. Clark-type oxygen sensors

Abstract

An electrolyte composition for screen printing, comprising: an organic solvent; an inorganic salt in the form of a fine powder able to pass through a screen printing mesh, the salt powder being dispersed in the organic solvent; and polyvinyl pyrrolidone dissolved in the organic solvent. A miniaturized oxygen electrode having an oxygen sensing site filled with the electrolyte composition. A process for producing a miniaturized oxygen electrode, including a step of patterning or selectively removing an oxygen gas-permeable membrane at a pad region by removing or peeling off an underlying cover film formed thereunder.

Claims

1. An electrolyte composition for screen printing, comprising:

an organic solvent;

a water soluble inorganic salt in the form of a fine powder of a size to pass through a screen printing mesh, said salt powder being dispersed in said organic solvent, said inorganic salt being selected from potassium chloride and sodium chloride; and

polyvinyl pyrrolidone dissolved in said organic solvent.

2. A composition according to claim 1, which further comprises a buffering agent.

3. A composition according to claim 2, wherein said buffering agent is selected from the group consisting of phosphate, acetate, borate, citrate, phthalate, tetraborate, glycine salt, and tris(hydroxymethyl)aminomethane salt.