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Inventor: Johnson; David A.
Address: Littleton, CO
No. of patents: 2
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 5566951 |
Method and apparatus enabling archery practice |
October 22, 1996 |
| An archery practice device projects a moving hunt scene on a screen. In one embodiment of the invention, a continuous plane of IR light is located prior to the screen, an arrow carrying a reflector is detected as it penetrates this light plane, and IR illumination is reflected back towar |
| 5394732 |
Method and apparatus for ultrasonic detection of air bubbles |
March 7, 1995 |
| Inclusions in a liquid flow, such as air bubbles in a blood flow, are detected by transmitting a signal through the fluid and receiving and interpreting the received signal based on the expected degree of attenuation for the liquid and the inclusions. The amplitude of the transmitted |
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