Richard C Mckay

US Patent:

6729552, May 4, 2004

Filed:

Apr 22, 2003

Appl. No.:

10/420142

Inventors:

Charles Nehemiah McEwen - Newark DE
William J. Herron - Newark DE
Richard G. McKay - Hockessin DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

A24F 2500

US Classification:

239 49, 239 44, 239 37

Abstract:

A device that can be used for dispersing a liquid is disclose. The device comprises a container, a capillary device, and a housing. The container has an open end that is connected to the capillary device and comprises a liquid. The capillary device comprises a substantially tubular member having one end secured to the open end of the container and the opposing end extended therethrough a substantially tubular capillary structure, which is coaxially aligned with the substantially tubular member. The capillary structure is in fluid communication with the liquid in the container. The housing comprises a first end having an opening attached thereon the container, a low voltage supplier attached to one wall, a high voltage converter attached to another wall, a voltage contact and a counter electrode, optionally a heat and/or lighting source, a wicking material, and further optionally electronics for voltage regulation. Also disclosed is a process for dispensing liquid using the device.

US Patent:

7977629, Jul 12, 2011

Filed:

Sep 3, 2008

Appl. No.:

12/231524

Inventors:

Charles Nehemiah McEwen - Newark DE, US
Richard Garrett McKay - Hockessin DE, US

Assignee:

M&M Mass Spec Consulting, LLC - Hockessin DE

International Classification:

H01J 49/10
H01J 49/26

US Classification:

250288, 250281, 250282

Abstract:

An ion source able to ionize both liquid and gaseous vapors from interfaced liquid separation techniques and a solids/liquid atmospheric pressure (AP) probe. The liquid effluents are ionized by electrospray ionization, photoionization or atmospheric pressure chemical ionization and the vapors released from a probe device placed in a heated gas stream in the AP source are ionized by a corona or Townsend electrical discharge or photoionization. The source has the ability to ionize compounds from both liquid and solid sources, which facilitates ionization of volatile and semivolatile compounds by applying heat from a gas stream as well as highly non-volatile compounds infused by electrospray or separated by liquid chromatography or capillary electrophoresis.

US Patent:

20100276589, Nov 4, 2010

Filed:

May 4, 2009

Appl. No.:

12/387590

Inventors:

Richard Garrett McKay - Hockessin DE, US
Charles Nehemiah McEwen - Newark DE, US

Assignee:

M&M MASS SPEC CONSULTING LLC - HOCKESSIN DE

International Classification:

H01J 49/00
G01J 3/10

US Classification:

250288, 250504 R

Abstract:

An atmospheric pressure (AP) mass spectrometry ion source able to ionize analytes in liquid effluents from interfaced liquid separation techniques and from individual containers, as in microtiter plates, by direct introduction of the analyte into the ion source using a moving ribbon, wire, or belt with vaporization of the analyte and subsequent ionization using an electric discharge or photoionization. The AP source may also incorporate atmospheric pressure chemical ionization (APCI), photoionization (APPI) and/or electrospray ionization (ESI), techniques that are commercially available. The source facilitates ionization of volatile and semivolatile compounds by applying heat from a gas stream to vaporize analyte entering the ionization region on a moving transport device. Solvent removal prior to sample entering the ionization region enables ionization of a wider range of compounds than liquid introduction APCI or APPI. The source is also capable of ionizing non-volatile compounds in solution by electrospray ionization, thus the combination provides almost universal ionization for organic compounds.