Mrl Industries, Inc.

Other

Sandvik Intellectual Property Ab

Noel Johnson

Kevin Peck

Thomas J Berdner

Pontus K H Nilsson

William D McEntire

Jim Sanches

Björn Å Larsson

Ronald D VanOrden

Robin H Slater

Bjorn A Larsson

Pontus KH Nilsson

Methods to determine an instantaneous resistance value of an electric circuit and a measurement system to determine an instantaneous resistance value of an electric circuit are disclosed. Exemplary embodiments of the method measure an in-situ instantaneous voltage of the circuit and an in-situ instantaneous current of the circuit and calculate the instantaneous resistance. Optional temperature measurement can be included in the method and the calculated instantaneous resistance related to the measured temperature. The method can be applied to phase angle fired loads and to zero-cross (time proportioned) loads.

High accuracy in-situ resistance measurements methods

A circuit is provided that provides for the same power characteristics to an assembly of electrical resistive elements wired in parallel as to the assembly as wired in series. An input power source provides electrical resistive power to a plurality of load elements, wherein the plurality of load elements are connected in parallel to each other. A plurality of power splitters divide the power source into separate and equal power subsources such that there is one power splitter and one power subsource for each load element, wherein the power provided to each of the plurality of load elements is equal to the power of the electrical power source. Redundancy and fault tolerance is provided to the circuitry by permitting remaining load elements to continue to operate should one or more load elements fail.

Circuit and fault tolerant assembly including such circuit

Heating element assemblies, heating furnaces incorporating heating element assemblies, methods to form heating element assemblies, methods to form heating furnaces and methods to reduce a magnetic field in a bifilar coil are disclosed. The heating element assembly includes two components, each component formed from heating element wire. The two components are spatially positioned and electrically arranged, relative to each other, so that an electrical current applied to the heating element assembly simultaneously travels through the two components in opposite directions.

Magnetic field reduction resistive heating elements

A method for monitoring the condition of a heating element involving installing the heating element in a location and setting the initial composition Cof the material as a reference baseline at an initial time Tcorresponding to said installation of the heating element. Data is then collected reflecting the subsequent composition Cof the heating element material after a subsequent time Tat the installed location and any change in the material composition of the heating element between Tand Tis monitored. An alarm is sent when the change reaches a threshold value indicating a possible failure condition. According to one embodiment, an impedance monitor is provided that calculates and compares impedance at the required levels of accuracy to determine changes in material composition. The impedance monitor, or portions thereof can be embedded within a microcontroller for increased portability and functionality.

Heating element condition monitor

A method for monitoring the condition of an electric current-carrying heating element involving installing the heating element in a location and setting the initial composition Cof the material as a reference baseline at an initial time Tcorresponding to said installation of the heating element. Data is then collected reflecting the subsequent composition Cof the heating element material after a subsequent time Tat the installed location and any change in the material composition of the heating element between Tand Tis monitored. An alarm is sent when the change reaches a threshold value indicating a possible failure condition. According to one embodiment, an impedance monitor is provided that calculates and compares impedance at the required levels of accuracy to determine changes in material composition. The impedance monitor, or portions thereof may be embedded within a microcontroller for increased portability and functionality.

A skateboard including a brake assembly for slowing and stopping the vehicle. A pivotal member on the rear of the board is provided with a depending rubber stop for engagement with the ground surface when the member is tilted by the heel of the shoe of the skater. The member is normally maintained in a raised position by a spring hinge.

Skateboard with tail brake

A skateboard including a brake assembly for slowing and stopping the vehicle. A pivotal member on the board is provided with a depending rubber stop for engagement with the ground surface when the member is tilted by the heel of the shoe of the skater.

Growing community of inventors

Sonora, CA, United States of America

Noel Johnson