Keith J Sjostrom

US Patent:

7612704, Nov 3, 2009

Filed:

Oct 30, 2008

Appl. No.:

12/262140

Inventors:

Kenneth J. Ryerson - Pella IA, US
Keith Sjostrom - Des Moines IA, US
David Hanson - Pella IA, US

Assignee:

Underground Imaging Technologies, Inc. - Latham NY

International Classification:

G01S 13/88
G01V 3/12

US Classification:

342 22, 342 27, 34235708

Abstract:

A mobile geophysical instrument produces geophysical data sets each associated with a position computed by use of a position sensor. A variable time delay results between a time when data for each geophysical data set is collected and a time when a position associated with each geophysical data set is recorded. A module receives distance transducer data and includes circuitry configured to generate a module signal based on trigger signals from the distance transducer and a calibration value. A data acquisition system (DAS) receives geophysical data sets from the geophysical instrument, positioning data from the positioning sensor, and the module signals. The DAS generates a DAS timestamp in response to each module signal and associates the DAS timestamp with each geophysical data set and a position associated with the geophysical data set, so as to substantially eliminate the variable time delay.

US Patent:

20030012411, Jan 16, 2003

Filed:

Jul 15, 2002

Appl. No.:

10/195856

Inventors:

Keith Sjostrom - Des Moines IA, US
Gary Young - El Paso TX, US

International Classification:

G06K009/00

US Classification:

382/109000

Abstract:

A system and method of detecting underground utilities and other subsurface objects involves acquiring object location data and displaying such data in a variety of ways to enhance object detection and usability of ground penetrating radar data.

US Patent:

20080079723, Apr 3, 2008

Filed:

May 16, 2007

Appl. No.:

11/804310

Inventors:

David Hanson - Pella IA, US
Keith Sjostrom - Des Moines IA, US
Ross Jones - Cambridge, GB
Peter Kellly - Cambridge, GB

International Classification:

G06T 15/10

US Classification:

345427000, 345419000

Abstract:

A user interface includes a display for displaying of a plurality of sensor data sets representative of signals associated with a plurality of sensors configured for sensing of a subsurface. At least some of the sensors are configured for subsurface sensing in a manner differing from other sensors of the plurality of sensors. Each of the sensor data sets comprises sensor data samples each associated with geographic position data. The sensor data sets are shown overlaid within a volume depicted on the display. The graphical representations of the sensor data sets are individually viewable within the volume and displayed in geographical alignment relative to one another within the volume in accordance with the geographic position data of the sensor data samples of each of the sensor data sets.

US Patent:

60282703, Feb 22, 2000

Filed:

Oct 16, 1998

Appl. No.:

9/173674

Inventors:

Keith J. Sjostrom - Clinton MS
Dwain K. Butler - Vicksburg MS

Assignee:

The United States of America as represented by the Army Corps of
Engineers - Washington DC

International Classification:

G01G 900
G01M 112
G01B 1100
G01B 1128

US Classification:

177 1

Abstract:

The mass of stockpiled materials is determined from detailed measurements of the elevation of the pile surface at many points and the measurement of the gravitational field along several profile lines across the surface of the stockpiled material. The elevation measurements allow the calculation of the pile volume. Measured gravity values are adjusted using standard gravity corrections in such a manner as to imply all gravity data are collected along the same reference datum. Variations in the corrected gravity values are assumed to be caused solely by the pile material. The gravity measurements are interpreted using analytical and statistical methods to determine the volume-average bulk density value of the pile material. The pile volume is multiplied by the volume-average bulk density to obtain the weight of the stockpiled material.

US Patent:

20190369283, Dec 5, 2019

Filed:

Sep 7, 2017

Appl. No.:

16/331825

Inventors:

- Pella IA, US
- Kent WA, US
Keith Sjostrom - Des Moines IA, US
Kenneth J. Ryerson - Pella IA, US

International Classification:

G01V 3/12
E21B 7/04
G01V 3/08
G01V 3/38
G01V 3/34
E21B 47/01

Abstract:

An electromagnetic sensor is configured for deployment at or near a cutting tool connected to a drill string and moveable by a horizontal directional drilling machine. The sensor comprises a housing having an exterior surface which is exposed to soil when the drill string and cutting tool move through the soil. An antenna arrangement and a power source are supported by the housing. Circuitry is disposed in the housing and coupled to the power source and the antenna arrangement. The circuitry is configured to generate a signal for transmission by the antenna arrangement, measure a performance characteristic of the antenna arrangement using a power detector coupled to at least a transmit antenna of the antenna arrangement, and detect a change in the antenna performance characteristic relative to a threshold indicative of contact between the cutting tool and a buried utility.

US Patent:

20190234199, Aug 1, 2019

Filed:

Apr 10, 2019

Appl. No.:

16/380168

Inventors:

- Pella IA, US
Tony BRIGGS - Pella IA, US
David HANSON - Colbert WA, US
Keith SJOSTROM - Des Moines IA, US
Nathan COPELAND - Pella IA, US
Hans KELPE - Pella IA, US
Tod MICHAEL - Chariton IA, US
Chad VAN SOELEN - Pella IA, US

Assignee:

VERMEER MANUFACTURING COMPANY - Pella IA

International Classification:

E21B 47/09
G01V 3/30
E21B 7/04
E21B 47/022
G01V 3/08
E21B 47/12

Abstract:

A locator device and methods of use are disclosed. The locator device includes a first locating system configured to generate to sense an electromagnetic field emanating from a sonde associated with a drill head, and a second locating system including a global positioning system. The locator device includes a display on the locating system configured to display a map of the area in which the locator device resides based on a location detected by the global positioning system. The locator device also includes control electronics configured to, upon receipt of an input from a user, record location data in a memory associated with the locator device for use by a horizontal directional drilling control system.

US Patent:

20170335677, Nov 23, 2017

Filed:

Apr 3, 2017

Appl. No.:

15/477428

Inventors:

- Pella IA, US
Tony BRIGGS - Pella IA, US
David HANSON - Colbert WA, US
Keith SJOSTROM - Des Moines IA, US
Nathan COPELAND - Pella IA, US
Hans KELPE - Pella IA, US
Tod MICHAEL - Chariton IA, US
Chad VAN SOELEN - Pella IA, US

International Classification:

E21B 47/09
E21B 47/022
E21B 7/04

Abstract:

A locator device and methods of use are disclosed. The locator device includes a first locating system configured to generate to sense an electromagnetic field emanating from a sonde associated with a drill head, and a second locating system including a global positioning system. The locator device includes a display on the locating system configured to display a map of the area in which the locator device resides based on a location detected by the global positioning system. The locator device also includes control electronics configured to, upon receipt of an input from a user, record location data in a memory associated with the locator device for use by a horizontal directional drilling control system.

US Patent:

20150090496, Apr 2, 2015

Filed:

Jun 21, 2012

Appl. No.:

14/127839

Inventors:

Scott Alan Rempe - Pella IA, US
Tony Briggs - Pella IA, US
David Hanson - Pella IA, US
Keith Sjostrom - Des Moines IA, US
Nathan Copeland - Pella IA, US
Hans Kelpe - Pella IA, US
Tod Michael - Chariton IA, US
Chad Van Soelen - Pella IA, US

Assignee:

VERMEER MANUFACTURING COMPANY - Pella IA

International Classification:

E21B 47/09

US Classification:

175 45

Abstract:

A locator device and methods of use are disclosed. The locator device includes a first locating system configured to generate to sense an electromagnetic field emanating from a sonde associated with a drill head, and a second locating system including a global positioning system. The locator device includes a display on the locating system configured to display a map of the area in which the locator device resides based on a location detected by the global positioning system. The locator device also includes control electronics configured to, upon receipt of an input from a user, record location data in a memory associated with the locator device for use by a horizontal directional drilling control system.