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Patents for John M. Douglas
Patents 1 - 14 of 14
First set of recordsLast set of records
NumberDatePatenteeTitleType
19,834Apr. 06, 1858W. Douglas, B. DouglasPortable pumphousehold hand pumps
33,299Sep. 17, 1861B. DouglasPump standhousehold hand pumps
35,802Jul. 01, 1862B. DouglasImproved side force-pumphousehold hand pumps
38,444May 05, 1863J.W. DouglasImprovement in pumpshousehold hand pumps
56,671Jul. 24, 1866J.W. DouglasDouble acting pumphousehold hand pumps
74,321Feb. 11, 1868J.W. DouglasImprovement in pumpshousehold hand pumps
81,611Sep. 01, 1868J.W. DouglasGrindstone Framegrinders
93,974Aug. 24, 1869J.W. DouglasKnapsack fire extinguisherfire extinguishers
97,767Dec. 14, 1869J.W. DouglasImprovement in pumpshousehold hand pumps
97,894Dec. 14, 1869J.W. DouglasImproved apparatus for extinguishing fires by means of chemical agentsfire extinguishers
98,674Jan. 11, 1870J.W. DouglasImprovement in adjustable attachment of pump-barrels to their baseshousehold hand pumps
173,601Feb. 15, 1876J.W. DouglasImprovement in vehicle-wheelswheelwright
192,979Jul. 10, 1877J.W. DouglasImprovement in portable pumpshousehold hand pumps
244,384Jul. 19, 1881J.W. DouglasPumphousehold hand pumps
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