David P Christensen

US Patent:

20060132293, Jun 22, 2006

Filed:

Nov 5, 2004

Appl. No.:

10/981611

Inventors:

Robert Andersen - Oro Valley AZ, US
David Christensen - Oro Valley AZ, US

International Classification:

B60Q 1/00

US Classification:

340425500

Abstract:

The “Child Alert” is a new application of current warning Systems technology to prevent anyone from leaving an infant in a vehicle. It is connected to the vehicle ignition and is activated upon it being turned off. A vocal alert would then sound that a baby is present.

US Patent:

20130216962, Aug 22, 2013

Filed:

Feb 19, 2013

Appl. No.:

13/770446

Inventors:

Bruce Dresner - St. Louis MO, US
Frank D. Wurth - Mascoutah IL, US
David M. Christensen - Sioux Falls SD, US

Assignee:

Empire Comfort Systems, Inc. - Belleville IL

International Classification:

F23N 1/02

US Classification:

431 6, 431 12, 431 89

Abstract:

A fuel burning space or zone heating appliance or heater rated or decorative fireplace (hearth appliance) and a method of operating a heater including a gas valve, a pressure transducer, a second pressure measurement device, a combustion fan, and a control. The control compares the signal from the pressure transducer to the signal from the second pressure measurement device. If the signals do not sufficiently correspond, the control prevents the gas valve from opening. If the signals sufficiently correspond, the control performs an ignition sequence and opens the gas valve. The control also compares the signal from the pressure transducer to a desired value based on a current input gas rate through the gas valve. If the signal is greater than the desired value, the control decreases power to the combustion fan. If the signal is less than the desired value, the control increases power to the combustion fan. If the signal is less than the desired value, the control turns the gas valve off to cease ignition.

US Patent:

20210001485, Jan 7, 2021

Filed:

Sep 23, 2020

Appl. No.:

17/029952

Inventors:

- BURBANK CA, US
STEVEN NIELS CHRISTENSEN - SAN MATEO CA, US
MARK SOX SETRAKIAN - LOS ANGELES CA, US
DAVID LOYAL CHRISTENSEN - BURBANK CA, US
GRANT MASARU IMAHARA - LOS ANGELES CA, US
MORGAN T. POPE - BURANK CA, US
SCOTT FRAZIER WATSON - MARINA DEL RAY CA, US
GÜNTER D. NIEMEYER - PASADENA CA, US

International Classification:

B25J 9/16
B25J 9/06
B25J 9/14
B25J 13/08

Abstract:

Systems and corresponding control methods providing a ballistic robot that flies on a trajectory after being released (e.g., in non-powered flight as a ballistic body) from a launch mechanism. The ballistic robot is adapted to control its position and/or inflight movements by processing data from onboard and offboard sensors and by issuing well-timed control signals to one or more onboard actuators to achieve an inflight controlled motion. The actuators may move an appendage such as an arm or leg of the robot or may alter the configuration of one or more body links (e.g., to change from an untucked configuration to a tucked configuration), while other embodiments may trigger a drive mechanism of an inertia moving assembly to change/move the moment of inertia of the flying body. Inflight controlled movements are performed to achieve a desired or target pose and orientation of the robot during flight and upon landing.

US Patent:

20190329414, Oct 31, 2019

Filed:

Apr 27, 2018

Appl. No.:

15/964710

Inventors:

- Burbank CA, US
STEVEN NIELS CHRISTENSEN - SAN MATEO CA, US
MARK SOX SETRAKIAN - LOS ANGELES CA, US
DAVID LOYAL CHRISTENSEN - BURBANK CA, US
GRANT MASARU IMAHARA - LOS ANGELES CA, US
MORGAN T. POPE - BURBANK CA, US
SCOTT FRAZIER WATSON - MARINA DEL RAY CA, US
GÜNTER D. NIEMEYER - PASADENA CA, US

International Classification:

B25J 9/16
B25J 9/14
B25J 9/06
B25J 13/08

Abstract:

Systems and corresponding control methods providing a ballistic robot that flies on a trajectory after being released (e.g., in non-powered flight as a ballistic body) from a launch mechanism. The ballistic robot is adapted to control its position and/or inflight movements by processing data from onboard and offboard sensors and by issuing well-timed control signals to one or more onboard actuators to achieve an inflight controlled motion. The actuators may move an appendage such as an arm or leg of the robot or may alter the configuration of one or more body links (e.g., to change from an untucked configuration to a tucked configuration), while other embodiments may trigger a drive mechanism of an inertia moving assembly to change/move the moment of inertia of the flying body. Inflight controlled movements are performed to achieve a desired or target pose and orientation of the robot during flight and upon landing.