The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Counterfeit coin detector

Patent drawing showing a metal counter plate with an inclined ramp leading into a pivoting, weighted spout flanked by upturned side gauges, plus top and inverted plan views labeled A and B showing the coin-sized openings.IMPROVEMENT IN COUNTERFEIT-COIN DETECTORS.William Painter · July 8, 1862A patent drawing of an oblong cast-iron plate with two rounded end flanges each bearing a screw hole, and a central section with five parallel vertical slots of decreasing width labeled f, e, A, d, c, shown in both top view and cross-section.IMPROVEMENT IN DEVICES FOR DETECTING COUNTERFEIT COIN.Thomas J. Towsey · February 27, 1877Patent drawing showing a small tilting platform device with hooked gages that hold a fifty-cent coin in place, a knife-edge pivot beneath the platform, and a hidden balance-weight chamber, illustrated in level and tipped positions plus a top-down view of the coin secured by the gages.IMPROVEMENT IN COUNTERFEIT-COIN DETECTERSJohn Wiarda · March 20, 1877Six 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 showing a bent metal bar with flanges and paired clasping lugs used as a tipping balance to test coin weight, alongside cross-section and alternate frame views.IMPROVEMENT IN COUNTERFEIT-COIN DETECTERSJohn A. Thompson · April 3, 1877Patent drawing of a rectangular metal case with two longitudinal slots in its top plate, an internal curved balance bar visible in cross-section, a projecting handle arm, and guide bars beneath the slots, shown from side, top, and end views.IMPROVEMENT IN COUNTERFEIT-COIN DETECTERSEdward Kronenberg · September 25, 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 of a combined letter scale and coin detector showing a balance plate on standards, a sliding indexed weight, and a tray with nested circular coin depressions and matching slots.IMPROVEMENT IN COUNTERFEIT-COIN DETECTERSEdwin Street · October 22, 1878Patent drawing of a 19th-century coin detector showing an angled chute with a pivoted magnet, lever, and push-off mechanism for trapping and ejecting false iron or steel coins from a vending machine.COIN-DETECTOR FOR AUTOMATIC VENDING-MACHINES.Alexander Jaeger · July 28, 1896Patent drawing of a vertical coin-testing chute assembly showing two stacked electromagnetic coils with laminated cores forming gaps through which a coin drops, flanked by insulating side panels with numbered passages, inclines, and outlet openings for sorting genuine coins from counterfeit slugs.ART OF TESTING COINS OR OTHER TOKENS FOR GENUINENESSFairfield W. Hoban · September 4, 1934