David A. Johnson, PE -
DiscoverCircuits.com
6601 County Road 6410 Lubbock, TX 79416-9717
Phone:
806-778-8407 Central Time Zone
email:
Dave Johnson |
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Patents Received by David 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.
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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 (Coupled
transponder and antenna system and method)
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.
(Method and
apparatus enabling archery practice)
Received US patent #5,566,951.
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Conducted research and designed
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,
(Method and apparatus for ultrasonic detection of air bubbles) 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
7,023,680
(Transient
voltage protection and ground status monitoring apparatus and method)
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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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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.
(Detection
of an RFID device by an RF reader unit operating in a reduced power state)
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Designed a system to flash large banks of conventional 40 watt
fluorescent lamps synchronized to a CCD camera system. UV light produced by the
lamps allowed “glow-in-the-dark” makeup to be placed on the face and arms of actors.
Movement of actors could then be recorded using the CCD cameras. Systems are
currently being used to produce animated movies.
Received US
Patent #7,567,293
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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. Received US Patent
#7,300,197
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