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:
May. 30, 1978
Filed:
Mar. 18, 1977
Mark S Zetter, Santa Clara, CA (US);
Dictaphone Corporation, Rye, NY (US);
Abstract
A combined specific ion and reference electrode structure having an air gap, gas permeable membrane and in which the active, conducting solution has a surface tension and boiling point which are great enough that with equal ambient pressures on both sides of the membrane the active solution will neither leak nor evaporate rapidly through the membrane at the temperature range over which the electrode structure is operated, namely -40.degree. C to 60.degree. C. In the preferred embodiment, the active solution solvent as well as the reference solution solvent are selected from among the class consisting of ethylene glycol, propylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethyleneglycol, hexylene glycol, propylene carbonate, dimethyl sulfoxide and dimethyl formamide.