Jeffrey P Owen

US Patent:

44315082, Feb 14, 1984

Filed:

Dec 10, 1982

Appl. No.:

6/432651

Inventors:

Harold M. Brown - Salt Lake City UT
Jeffrey D. Owen - Salt Lake City UT

International Classification:

G01M 2726

US Classification:

204418

Abstract:

A solid state graphite electrode to determine the activity of an ion-specie in solution. The graphite electrode of the present invention can be adapted for use as either an external reference electrode, an ion-selective electrode or as an internal reference electrode. The electrode includes, as an electrically conductive element, a supported section of graphite that is appropriately electrically connected through a potentiometer to show a difference in ion concentration as a voltage potential or emf. One graphite surface for immersion in a test solution is hydrophobized by coating it with a solution that contains an organic liquid molecule to covalently bond with hydroxyl groups (OH) of the graphite surface, rendering that surface hydrophobic. Preferably, the organic liquid is a silanizing agent, which coating after drying is covered with a hydrophobic layer or membrane that is preferably a polyvinylchloride (PVC) plastic. For an ion-selective electrode, an ion sensor for the ion to be sensed is mixed in the membrane material coated over the hydrophobized graphite and in another embodiment for an internal reference electrode, a hydrophilic membrane containing pairs of a same chemical specie in differing oxidation states or redox couple can be sandwiched therebetween.

US Patent:

45619638, Dec 31, 1985

Filed:

Jul 30, 1984

Appl. No.:

6/635755

Inventors:

Jeffrey D. Owen - Salt Lake City UT
Harold M. Brown - Salt Lake City UT

Assignee:

Zinetics Medical Technology Corporation - Salt Lake City UT

International Classification:

G01N 2730

US Classification:

204433

Abstract:

A solid state electrode that includes a graphite core as both the internal reference and the electrical conductor that is preferably formed of graphite threads maintained as a bundle that in one embodiment, has an end thereof coated with a mixture of antimony and antimony oxide as a sensor element, the graphite junction forming the internal reference to that sensor element, and in another embodiment, the graphite core is wrapped tightly around a sensor formed from section or "shot" of a mixture antimony and antimony oxide, the graphite junction forming the internal reference thereto. The connected graphite core and antimony/antimony oxide sensor are then covered with an impermeable non-conductive plastic sheath, leaving a section of the antimony/antimony oxide sensor surface exposed, and the junction of that sheath to the antimony/antimony oxide sensor is preferably sealed as with an epoxy.

US Patent:

42514703, Feb 17, 1981

Filed:

Oct 26, 1979

Appl. No.:

6/088698

Inventors:

Jeffrey D. Owen - Salt Lake City UT
Harold M. Brown - Salt Lake City UT

Assignee:

University of Utah - Salt Lake City UT

International Classification:

C07F 909

US Classification:

260990

Abstract:

An improved electroactive material for solid state, Ca. sup. ++ sensitive electrodes comprising highly purified di-[p-(1,1,3,3-tetramethylbutyl)phenyl] phosphoric acid or the corresponding calcium salt thereof.