JOHN K RHODES, JR
Electrician at Baxter Dr, Austin, TX

6830730, Dec 14, 2004

Sep 11, 2001

09/951760

John R. Rhodes - Austin TX

SpectrolAnalytical Instruments - Marble Falls TX

G01N 3112

422 78, 422 50, 422 62, 422 8201, 422 8202, 422 83, 422 90

An improved on-stream analyzer for monitoring sulfur or nitrogen content of liquid petroleum or beverage products is described. It consists of the following main components: a sample injector for injecting predetermined fixed volumes of the liquid into a thermal oxidizer (pyrolyzer) at a preset, controlled rate, a thermal oxidizer in which an inert carrier gas and oxygen are introduced at measured and preset, controlled rates to thermally oxidize the sample at a temperature of about 1050° C. , sample conditioner to control the relative humidity and temperature of the resulting gas mixture, an electrochemical cell sensitive to sulfur dioxide (SO ) or NO to measure the concentration of SO or NO in the gas mixture, and a programmable logic controller (PLC) to calculate the sulfur content of the original sample and manage the analyzer. Although the analyzer is designed primarily for monitoring sulfur content of petroleum and beverage products, it is recognized that essentially the same equipment can be used to analyze any liquid having a suitable viscosity and capable of being completely thermally oxidized under the conditions specified.

3940614, Feb 24, 1976

Jan 21, 1974

5/434774

John R. Rhodes - Austin TX
David H. Weinstein - Brookshire TX
Andrzej H. Pradzynski - Austin TX

Columbia Scientific Industries Corporation - Austin TX

G01n 2300

250273

Method and apparatus for detection of mercury vapor present in environmental atmosphere for the purpose of detecting the degree of environmental mercury pollution that might be present. Environmental air is passed through a bed of fibrous material such as glass wool, the fibers of which are coated with a noble metal, such as silver, capable of extracting mercury vapor from the environmental air. The bed of fibrous material may be placed within a heating chamber where sufficient heat is applied to drive off the collected mercury and a clean and perhaps inert gasiform fluid, such as clean air, nitrogen, argon, etc. is passed through the heating chamber to serve as a carrier for mercury vapor that is driven off of the bed of fibrous material. The mercury vapor laden carrier gas is then cooled and the mercury vapor present in the gas is collected by passing the gas through a screen of nylon mesh that is also coated with the noble metal. The mercury vapor that is collected by the coated nylon mesh may be analyzed with an x-ray fluorescence spectrometer capable of accurately detecting and measuring the amount of mercury present in the sample.

6867047, Mar 15, 2005

Jan 23, 2002

10/055726

John R. Rhodes - Austin TX, US

Spectro Analytical Instruments - Marble Falls TX

G01N033/00

436118, 436116, 436117, 436155, 436159, 436160, 422 78

Methods and apparatus are described for preventing nitrogen interference in the detection of a substance. In particular, it relates to new methods and apparatus for preventing interference due to nitrogen in pyro-electrochemical methods for measuring substances, for example sulfur content, contained within liquids such as petroleum products and beverages. One preferred apparatus and method comprises a catalytic converter or thermal converter to selectively remove the nitrogen-containing interferant, for example NO, in the pyrolyzed gas stream to NO without affecting the sulfur content. A second preferred apparatus and method comprises a chemical scrubber to selectively remove the nitrogen-containing interferant from the gas stream without affecting the sulfur content.

4021667, May 3, 1977

Jul 3, 1975

5/592756

Kermit D. Clausen - Houston TX
John R. Rhodes - Austin TX

Columbia Scientific Industries Corporation - Austin TX

G21K 100

250273

Method and apparatus for first converting energy pulses, such as from the energy-dispersive detector of an emission spectroscopy system, into multiple ramp signals, the ramps of which are parallel with the vertical distance between the ramps being proportional to energy pulse height. Digital samples of the ramps are taken and, from the known slope of the ramps, the vertical distance or difference may be determined using a least-squares algorithm. This value is the absolute amplitude pulse value.

4137751, Feb 6, 1979

Feb 28, 1975

5/554114

John R. Rhodes - Austin TX
Robert D. Sieberg - Austin TX
Morris C. Taylor - Austin TX
John C. Westkaemper - Austin TX
Robert C. Young - Idaho Falls ID

Columbia Scientific Industries, Inc. - Austin TX

B01D 4600, G01N 3106

73 28

A method and apparatus are disclosed for improved collection of airborne particles in an airborne prospecting method. A high volume of air is sampled and processed through a cyclone separator to achieve a high concentration of particle collection on a collecting surface. The collected particles may be analyzed as to mineral element type and correlated with the geographical position of collection to permit a deduction as to the type of minerals and soil in the terrain below.