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Hank Harjes

(B.S.E.E., Virgina Polytechnic Institute, 1967)

Electrical Engineer: Electronic ground-based and rocket-borne instrumentation design, development, and fabrication.

Current Patents

Portable battery operated power managed event recorder and interrogator system:

United States Patent 5,835,025

Zufelt, et al. November 10, 1998

A data acquisition apparatus that includes a recorder device of an event's time and date signified by the opening of an external trigger switching circuit in combination with a complimentary interrogator device for collecting data from the recorder device. The recorder device's components comprise a battery powered source with a power regulator, a processor, a dip-switch identifier, a programmable read only memory, a clock/ calendar with random access memory, a timing/control subcircuit interface that connects to the external trigger switching circuit(s) and an output interface port for data transmissions with the interrogator device. The recorder's timing/control subcircuit interface extends battery life by sensing and transmitting electrical pulses through each external trigger switching circuit. The interrogator device is portable and has multiple functional capabilities. This interrogator comprise an regulated battery power source, a processor, a programmable ROM, an event storage RAM, a clock/calendar subcircuit, an optional liquid crystal display display, and an input/output interface port to communicate with the recorder device.

For more information, visit the US Patent Office web site at http://www.uspto.gov, and search for the appropriate patent number.

Expired Patents

Portable battery operated power managed event recorder and interrogator system:

United States Patent 3,810,102

Parks, III et al. May 7, 1974

The invention can be most readily explained by mean of an illustrative example which shows how the system is used to acquire, transform, transmit and reconstruct an ECG for subsequent analysis and interpretation by computer.  In general, in the preferred embodiment the analog ECG signal is sampled and converted to a digital signal at a data rate of 1,600 bits per second and then stored on tape for subsequent transmission over telephone lines to a central station.  At the central station the digital data are reconstructed to the 5,000 bit per second data rate required by the ECAN diagnostic program by mean of a digital interpolation scheme.

For more information, visit the US Patent Office web site at http://www.uspto.gov, and search for the appropriate patent number.