John W Jordan

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:

55579698, Sep 24, 1996

Filed:

Jun 27, 1995

Appl. No.:

8/495099

Inventors:

John Jordan - Oldsmar FL

Assignee:

Energy and Environmental Technologies Corporation - Santa Rosa CA

International Classification:

G01N 2920

US Classification:

73592

Abstract:

An ultrasonic leak detector which discriminates against leak signals originating from outside a desired detection zone. Incoming ultrasonic waves are divided into mutually exclusive low and high frequency signals, which signals are then processed to form an intensity ratio. The intensity ratio is compared to a pre-selected ratio corresponding to an ultrasonic source at the boundary of the detection. Ultrasonic leak signals originating from outside the desired detection zone are ignored. The presence of a leak within the detection zone is indicated by audio and/or visual devices.