US 11,774,404 B2Granted

Corrosion resistant electrodes

AssigneeWyatt Technology Corporation

InventorSteven P. Trainoff

Life of this patent

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Abstract

An electrode for use in instruments capable of measuring the electrophoretic mobility of particles in solution is disclosed. The electrode is comprised of an inexpensive support member, generally made of titanium, onto a flat surface of which has been connected, generally by microwelding, a flat electrically conductive but chemically inert foil member, preferably platinum. A uniform texture can be generated on the exposed surfaces of the electrode by various means including tumbling the electrode with an abrasive. An oxide layer can be generated on the support member by soaking the composite electrode in an appropriate medium, protecting the exposed surface of the support member from fluid contact with the sample solution, while the foil member, unaffected by the oxidation process, is able to contact the sample solution.

Claims9

Dependent claims

An electrode comprising:

an electrically conductive support member comprising at least one planar surface;
and
a flat, chemically inert, electrically conductive foil member,
wherein the foil member is welded by an electron beam to the conductive support member about the perimeter of the foil member, resulting in a composite,
wherein the composite comprises an exposed surface of the foil member and an exposed surface of the support member,
wherein the exposed surface of the foil member comprises a uniform, non-smooth surface resulting from etching the exposed surface of the foil member,
wherein the etching the exposed surface of the foil member comprises mechanically tumbling the composite with an abrasive,
wherein a final surface finish of the etching is controlled by adjusting a tumbling time of the tumbling and adjusting a bead size of the abrasive, and
wherein the exposed surface of the support member comprises an oxide layer resulting from exposing the composite to an oxidation agent,
resulting in the composite being chemically inert.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/736,797Filed 7 Jan 2020 · continuation
Priority: 31 Jan 2013
Published: US 2020/0141902 A17 May 2020
Granted: 3 Oct 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

G01N 27/44765
Apparatus specially adapted therefor: of the counter-flow type
B23K 15/0093
Welding: characterised by the properties of the materials to be welded
C25B 11/02
Electrodes; Manufacture thereof not otherwise provided for: characterised by shape or form
C25B 11/081
Consisting of a single catalytic element or catalytic compound: the element being a noble metal

Family

Application61/759,207Us provisional application · filed 31 Jan 2013
Application14/169,008Parent of this division · filed 30 Jan 2014
Application15/130,762Parent of this continuation · filed 15 Apr 2016
Application16/180,034Parent of this continuation · filed 5 Nov 2018
US 2020/0141902 A1Pre-grant publication · published 7 May 2020
US 10,527,583 B2Parent of this continuation
US 10,119,935 B2Parent of this continuation
Application15/130,762Parent of this division
US 2014/0209466 A1Published application
US 2016/0231273 A1Published application
US 2019/0072517 A1Published application
US 11,774,404 B2This patent

From the US filing history. Foreign family members aren’t listed.