Back to results
US 5,621,418 AGranted
FM-very high frequency metal detector
OwnerDaniel P. Maloneyinventor
Life of this patent
Estimating the term…
Abstract
A modified loop and nondirectional antenna system and receiver used in conjunction with a magnetic compass and 2 level vials for a point direction used to detect underground parasitic antennas or reflectors by supression and reception of receiver. The detector is directed at very deep propagated radio waves, several hundred feet deep or less.
Claims2
A FM underground metal detection antenna system using propagated radio waves, capable of detecting metal several hundred feet into the ground, comprising:
- a wood main frame;
- attached 28" W.times.25" L modified circular antenna loops;
- a full circle nondirectional antenna and a full curve antenna;
- said modified loops being separated by 3/8 inch of space between them, and said full circle nondirectional antenna fitting tightly on the outer parts of said modified loops;
- said full curve antenna fitting above and on top of said modified loops and on top of said full circle antenna at crossover points;
- said modified loops and said full curve antenna being connected to a first end of a sensitive FM receiver antenna via a first copper strand wire;
- and
- said full circle nondirectional antenna being connected to a second end of said sensitive FM receiver antenna via a second copper strand wire.
5 more elements
Dependencies are inferred from the claim text.