Richard P Kolman

US Patent:

6894778, May 17, 2005

Filed:

Apr 22, 2003

Appl. No.:

10/420250

Inventors:

Perry A. Palumbo - Fort Collins CO, US
Paul D. Schlegel - Loveland CO, US
Jeffrey M. Huhta - Loveland CO, US
Richard P. Kolman - Loveland CO, US

Assignee:

Hach Company - Loveland CO

International Classification:

G01N021/00

US Classification:

356338

Abstract:

A turbidimeter having an arrangement of internal surfaces, optical surfaces, and optical restrictions to the field of view of both the illumination and the detector means to significantly improve the lower detection limit of the turbidimeter by reducing the detected signal due to stray light.

US Patent:

58723617, Feb 16, 1999

Filed:

Mar 24, 1997

Appl. No.:

8/823089

Inventors:

Ernie R. Paoli - Loveland CO
Stephen K. Wilcken - Seattle WA
Richard P. Kolman - Loveland CO

Assignee:

Hach Company - Loveland CO

International Classification:

G01N 2149

US Classification:

2503418

Abstract:

A turbidimeter is described for measuring the turbidity of a liquid. The turbidimeter includes (a) a sample cell for the liquid to be tested, (b) an optical source such as a light-emitting diode (LED) for producing a light beam directed at the sample cell; (c) an optical detector, and (d) non-imaging optical concentrator located between the sample cell and the optical detector for concentrating light scattered by the liquid in the sample cell. The optical concentrator is preferably integral with the sample cell holder and it exhibits a sharp field of view which minimizes the effect of stray light in the instrument. The optical detector means produces a signal in response to the amount of scattered light it detects. The signal is converted to a turbidity value which is displayed. The turbidimeter can be battery powered and is small and compact.

US Patent:

55066798, Apr 9, 1996

Filed:

Sep 8, 1994

Appl. No.:

8/303176

Inventors:

Richard J. Cooper - Loveland CO
Kevin A. Keilbach - Ft. Collins CO
Richard P. Kolman - Loveland CO
Ernie R. Paoli - Loveland CO
Kenneth L. Stutzman - Ft. Collins CO
Robert D. Stream - Ft. Collins CO

Assignee:

Hach Company - Loveland CO

International Classification:

G01N 2100

US Classification:

356338

Abstract:

A nephelometer instrument capable of measuring from zero to 10,000 NTUs. The instrument includes four light detectors, three of which are positioned such that they measure light scattered at specific directions by a liquid sample. The fourth detector measures light transmitted through the sample. A removable light filter is also included. The light beam is focused on the front surface of the sample cell.

US Patent:

42066549, Jun 10, 1980

Filed:

Oct 19, 1978

Appl. No.:

5/952771

Inventors:

John T. Keller - Willoughby OH
Lawrence P. Madson - Littleton CO
Richard P. Kolman - Denver CO

International Classification:

G01N 2900

US Classification:

73620

Abstract:

An ultrasonic scanner is disclosed for examining a planar region of a patient. The scanner has a transducer for emitting ultrasonic waves into the planar region of a patient which is defined by an array of subregions separated by subregion boundaries and for transforming echoes received from the planar region into electronic diagnostic values, and an electromechanical device for producing an indication of the position and the angular orientation of the transducer. The scanner also has a main memory having a plurality of addresses corresponding to the subregions for storing such diagnostic value at an address corresponding to the represented subregion, and a CRT display for displaying the diagnostic values stored in the memory. The position indication and angular orientation indication are used for generating the memory address for the diagnostic values corresponding to each echo. The addresses are generated with an analog processor, accumulator and buffer.

US Patent:

56045905, Feb 18, 1997

Filed:

Feb 6, 1996

Appl. No.:

8/597217

Inventors:

Richard J. Cooper - Loveland CO
Kevin A. Keilbach - Ft. Collins CO
Richard P. Kolman - Loveland CO
Ernie R. Paoli - Loveland CO
Kenneth L. Stutzman - Ft. Collins CO
Robert D. Stream - Ft. Collins CO

Assignee:

Hach Company - Loveland CO

International Classification:

G01N 2100

US Classification:

356338

Abstract:

A nephelometer instrument capable of measuring from zero to 10,000 NTUs. The instrument includes four light detectors, three of which are positioned such that they measure light scattered at specific directions by a liquid sample. The fourth detector measures light transmitted through the sample. A removable light filter is also included. The light beam is focused on the front surface of the sample cell.