A co-worker recently mentioned a patent I had never seen:
Coin Discriminating Apparatus Using Coil Pulses of Different Lengths
This is for a coin-operated vending machine and covers the use multiperiod PI.
In a prior thread some people "debated" the validity of the Minelab multiperiod patent, citing the Poole patent as prior art. It was never explained why the Poole patent constituted prior art, as it uses a different technique.
But this patent appears to show precisely the same technique, so those looking to invalidate the Minelab claims may want to study this patent. In a cursory examination it appears that there may be more vending machine patents worth a look. Also slot machines and traffic sensors.
- Carl
Coin Discriminating Apparatus Using Coil Pulses of Different Lengths
This is for a coin-operated vending machine and covers the use multiperiod PI.
In a prior thread some people "debated" the validity of the Minelab multiperiod patent, citing the Poole patent as prior art. It was never explained why the Poole patent constituted prior art, as it uses a different technique.
But this patent appears to show precisely the same technique, so those looking to invalidate the Minelab claims may want to study this patent. In a cursory examination it appears that there may be more vending machine patents worth a look. Also slot machines and traffic sensors.
- Carl
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