The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Coin gauge

Six circular diagrams of a metal coin-testing disk showing concentric slots labeled a, c, and diameter markings 10, 25, and 50, with a pivoting knife-edge rod extending from the side, illustrating coins tilting up or down depending on weight.IMPROVEMENT IN COUNTERFEIT-COIN DETECTERSJohn W. Sutton · March 27, 1877Technical patent drawing of a balance-lever coin detector showing a gage-arm A with cross-pieces B, D, and K on one side, an elongated weighted arm E on the other, pivoted atop a stand G, with additional detail views of the pivot mechanism and gage cross-section.IMPROVEMENT IN COIN-DETECTERSPatrick Doherty · June 19, 1877Patent drawing of a combined postal scale and counterfeit-coin detector showing a plan view (Fig. 1) with a large graduated disk marked for gold, silver, and postage rates, and a side cross-section (Fig. 2) showing the beam, counterweight box with shot, and coin pan.IMPROVEMENT IN POSTAL-SCALE AND COUNTERFEIT-COIN DETECTER.Harvey Maranville · April 30, 1878Patent drawing showing a boxed coin-detector mechanism with a pivoting weighted lever, coin pans, a scale-beam arm with a hook, and a coin-roll compressor with sliding guides, illustrated in five labeled figures.COIN-DETECTOREmil Bachmann · September 18, 1883Patent line drawing showing a tall coin-operated cabinet mechanism (Fig. 1) with a hinged coin slide, magnet, push-handle, camera and dash-pan assembly, alongside a detail front view of the money-box (Fig. 3) and a partial side view (Fig. 2) of the slide linkage.COIN FREED OR ACTUATED MACHINE.Helen Alicia Burt · March 29, 1892Technical patent drawing of a cylindrical coin selector casing with an internal plunger, spring-loaded disk, pivoting valve plate, gauge rods, and an electromagnet assembly used to test and sort coins in a vending machine.COIN-SELECTORGeorge C. Reith and George F. Flade · September 17, 1912