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Patents Granted on 1820-__-__
Patents 1 - 15 of 121
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3,160XJan. 04, 1820J. BraggImprovement in bridges
3,161XJan. 10, 1820E. TreadwellBread finisher
3,162XJan. 10, 1820E. CrainMaking ropes and cordagerope maker
3,163XJan. 14, 1820W.W. SwainMoulding spermaceti candles by heat applied to the mouldschandler
3,164XJan. 15, 1820W. MartinMortise water lock gate
3,165XJan. 18, 1820C. WilliamsImprovement in railways and carriages
3,166XJan. 18, 1820Z. Chapin, S. MartinMachine for washing, drying, and screening wheatmiller
3,167XJan. 22, 1820C. Leek (Leck)Raising the power of steam in steam engines without increasing the quantitysteam engines
3,168XJan. 24, 1820P. CooperMachine for towing boats on canalsnautical propulsion apparatus
3,169XJan. 28, 1820I. TownTruss Bridge
3,170XJan. 28, 1820J. KendallApparatus for preparing the oxy muriate of lime
3,171XJan. 29, 1820J. RussellCoating for ships' bottomsboats and ships
3,172XFeb. 01, 1820C. WhiteWater proof cement
3,173XFeb. 17, 1820J. Kelly, A. BuffumElastic water proof hats
3,174XFeb. 17, 1820J. WilliamsMakring spruce beer
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