Coin checking method and apparatus employing wave train comparison
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 11, 1986
Grant Date -
N/A
app pub date -
Mar 20, 1984
filing date -
Mar 21, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A coin 12 to be checked is passed through a test coil 1 connected in parallel with a capacitor 2. A comparison coil 3 having an adjustable core 5 is also connected in parallel with a capacitor 4 and a direct current is passed through both coils in parallel from a rail 13 to an interrupter 14. The simultaneous interruption of the current through both coils produces between each coil and its capacitor a respective oscillatory discharge in the form of a decaying wave train and the characteristics and dimensions of the two coils and their capacitors are such that when a coin of the selected denomination passes through the test coil, the two wave trains are substantially identical. The two wave trains are compared by a comparator device 6 and a voltage comparator 7 generates a signal when the result of the comparison is below a predetermined datum, thus indicating that the coin is a genuine one.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully