John Brady Jordan

US Patent:

59778490, Nov 2, 1999

Filed:

Jul 22, 1997

Appl. No.:

8/898134

Inventors:

Ching-yuan L. Hsing - West Hills CA
John E. Jordan - Rancho Palos Verdes CA
Paul J. Tatomir - Laguna Niguel CA

Assignee:

Huhges Electronics Corporation - El Segundo CA

International Classification:

H01P 706

US Classification:

333232

Abstract:

An electromagnetic wave component uses one or more diaphragms secured to the interior of a waveguide structure to tune its resonant frequency, with each diaphragm engaged by one or more adjustment members that deform it. The adjustment members are preferably screws that are threaded through the structure to push and/or pull on the diaphragms, thereby tuning the electromagnetic wave component. The shift in the resonant frequency of the electromagnetic wave component due to temperature-induced dimensional changes is mitigated if the materials used for the diaphragm, the adjustment members and the structure which houses the diaphragm are chosen to have an appropriate combination of thermal coefficients of expansion.

US Patent:

51929848, Mar 9, 1993

Filed:

Dec 19, 1990

Appl. No.:

7/630087

Inventors:

Gary R. Beecher - Laurel MD
David L. Kemper - Silver Spring MD
John E. Jordan - Germantown MD

Assignee:

Environmental Analytical Systems, Inc. - Elkridge MD

International Classification:

G01N 2101

US Classification:

356433

Abstract:

Apparatus and method for determination of concentrations of a substance in solution in a sample by determining the time between when the substance first appears and when it disappears. The time between the appearance and the disappearance of the substance is used to determine the concentrations of the substance in a sample. The apparatus includes many elements of a flow injection analysis system but also includes a very important stirred dilution chamber that enables the apparatus to use a simplified detection system that is capable of being used over a wide range of sample concentrations. The apparatus can include a microwave digestion system and in one embodiment a continuous flow microwave digestion system.

US Patent:

60577487, May 2, 2000

Filed:

May 14, 1999

Appl. No.:

9/311441

Inventors:

Ching-yuan L. Hsing - West Hills CA
John E. Jordan - Rancho Palos Verdes CA
Paul J. Tatomir - Laguna Niguel CA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H01P 700
H01P 706
H01P 704
H01P 130

US Classification:

333224

Abstract:

An electromagnetic wave component uses one or more diaphragms secured to the interior of a waveguide structure to tune its resonant frequency, with each diaphragm engaged by one or more adjustment members that deform it. The adjustment members are preferably screws that are threaded through the structure to push and/or pull on the diaphragms, thereby tuning the electromagnetic wave component. The shift in the resonant frequency of the electromagnetic wave component due to temperature-induced dimensional changes is mitigated if the materials used for the diaphragm, the adjustment members and the structure which houses the diaphragm are chosen to have an appropriate combination of thermal coefficients of expansion.