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Elpers
Christopher Elpers, Evansville, IN US
| Patent application number | Description | Published |
|---|---|---|
| 20080266110 | SYSTEM AND METHOD FOR TRACKING PERSONNEL AND EQUIPMENT - A system for tracking personnel and equipment in hazardous environments in pre or post-accident situations includes an intrinsically safe tracking tag and an intrinsically safe reader system. The intrinsically safe tracking tag transmits identification and status information to the intrinsically safe reader system, which includes a plurality of intrinsically safe antennas and a hub cable driver. In one embodiment, antennas are located at known positions in the hazardous environment and connected via a redundant, wired-mesh topology. The wired-mesh topology also allows more flexible antenna placement than line-of-sight wireless-mesh systems. The hub cable driver provides intrinsically safe power to and communication with the antennas using communication cables, receives data signals from the antennas, and transmits the data signals to a server. The server stores the data signals in a storage device and is connected to a workstation. The workstation retrieves the stored data to track persons or equipment. | 10-30-2008 |
Christopher J. Elpers, Evansville, IN US
| Patent application number | Description | Published |
|---|---|---|
| 20090267787 | SYSTEM AND METHOD FOR PROXIMITY DETECTION - A system and method for detecting a proximity of a person to a machine includes a first transmitter unit carried by the person, a plurality of receiver units located on the machine at know locations, and a processing unit including data defining a first boundary around the machine. The first transmitter unit transmits a magnetic proximity signal having a predetermined signal strength and a predetermined signal frequency. Each of the plurality of receiver units is for determining a received signal strength of the received magnetic proximity signal. The processing unit: determines a location of the first transmitter unit relative to the machine based on the received signal strength of the magnetic proximity signal and the known location of the plurality of receiver units; and outputs a proximity warning signal if the location of the transmitter relative to the machine is within the first boundary around the machine. | 10-29-2009 |
Mark Elpers, Elk River, MN US
| Patent application number | Description | Published |
|---|---|---|
| 20090067319 | SYSTEMS AND METHOD FOR ORTHOGONAL FREQUENCY DIVISIONAL MULTIPLEXING - Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a method for ranging comprises: receiving at a host a plurality of upstream symbols transmitted from a plurality of remote units, the upstream symbols transmitted on a plurality of orthogonal carriers modulated using an inverse Fourier transform; comparing a phase of at least one ranging symbol received from at least one of the plurality of remote units with a phase of a symbol transmitted by the host; and transmitting an adjustment instruction instructing the at least one of the plurality of remote units to vary a phase of transmissions transmitted from the at least one of the plurality of remote units based on a difference in phase between the at least one ranging symbol and the symbol transmitted by the host unit. | 03-12-2009 |
Philip Elpers, Evansville, IN US
| Patent application number | Description | Published |
|---|---|---|
| 20110207562 | BASKETBALL BACKBOARD AND RIM MOUNTING SYSTEM - Certain embodiments of the present system deal with a basketball goal assembly which adjustably supports a backboard assembly and a rim assembly to enable players to play the game of basketball. In certain preferred aspects, the rim assembly is connected directly to the support arrangement so that force applied to the rim assembly is transmitted directly to the support assembly and is not transferred to the backboard assembly. | 08-25-2011 |
| 20110207583 | MULTI-POSITIONED ANGLED STEP AND RISERS - An adjustable stepping structure for aerobic exercise is disclosed having a platform and a plurality of support elements. The support elements include a downwardly arcuate notch or channel for receiving a sidewall or endwall of the platform, allowing the platform to be arranged in multiple angled orientations. | 08-25-2011 |