Resume of David A. Johnson, P.E.
13355 Lafayette Way Thornton,
Colorado 80241-1192
(303) 252-9787
email: Dave Johnson |
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Chief designer of a new RFID card reader that cost
about one half the reader it replaced. Developed
a very low power radio frequency identification (RFID) card reading
system. The system was used as a replacement to hotel room door lock
keys.
Received US patent #6,476,708.
- Helped develop a wireless method to monitor the air pressure and
temperature inside an automobile tire. The system used a custom radio
frequency identification (RFID) circuit. A special antenna allowed an
external magnetic excitation field to power the RFID circuit and retrieve
the tire data.
Received US patent #7,019,711 and one Brazilian
patent.
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Helped develop a complete video interactive
archery/firearm shooting range system. System projected moving targets
onto a fabric screen using a computer, laser disk player and video
projector. Reflector tipped arrows and an infrared CCD camera determined
where the arrows hit the target. Also developed a similar shooting range
system that used infrared laser equipped pistols, rifles and shotguns.
Systems launched laser light pulses at screen targets instead of arrows.
500+ installations now installed and operating. Wrote detailed
descriptions for a patent application on the techniques used.
Received
US patent #5,566,951.
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Conducted research and designed circuits to detect,
count and size air bubbles in blood using ultrasound techniques. Bubbles
with volumes less than 1 nanoliter were detectable. Circuit used in a
kidney dialysis machine. Designed and built a portable battery powered
bubble monitor used by the company's sales force to show potential buyers
the bubble-free nature of the disposable dialysis machine tubing sets.
Wrote circuit descriptions for a patent application on the bubble detector
system. Received
US patent #5,394,732, Japan patent #2823513
and European patent..
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Developed a product that monitored the resistance of a
domestic earth ground connection. The circuit also measured the earth
ground current and the voltage with respect to the power line neutral
wire. System was used in conjunction with a transient voltage suppression
system.
Received US
Patent
7023680
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Developed a system to monitor the concentration of a
soap/water mixture used in carwash soap dispensing systems. The method
used an optical technique to maintain the desired soap concentration.
Wrote a description of the electronic circuit used in the monitor. Over
3,000 systems were installed. One patent pending.
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