Manufacturers Index - W. & B. Douglas
W. & B. Douglas
Middletown, CT, U.S.A.
Manufacturer Class:
Metal Working Machinery & Steam and Gas Engines
This page contains information on patents issued to this manufacturer.
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X9,043
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Aug. 20, 1835
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Pump
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William Douglas |
Middletown, Middlesex County, CT |
Most of the patents prior to 1836 were lost in the Dec. 1836 fire. Only about 2,000 of the almost 10,000 documents were recovered. Little is known about this patent. There are no patent drawings available. This patent is in the database for reference only. |
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2,895
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Dec. 31, 1842
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Pump
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Benjamin Douglas |
Middletown, CT |
This can be considered the first commercially produced pump. This pump "may be conveniently adapted to any part of a dwelling or other place where the room is cramped, also so that the lower box or valve may be got at with much less difficulty than in the old and ordinary way, and in having the stand to which the brake is attached permanently secured by set screws uniting with a stirrup beneath a projection in the cylinder, and also the manner of securing the lower valve in its place..." |
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Pump
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William Douglas |
Middletown, CT |
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19,834
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Apr. 06, 1858
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Portable pump
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Benjamin Douglas |
Middletown, CT |
This pump "is especially applicable to watering gardens, syringing plants, washing windows, and like purposes." |
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Portable pump
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William Douglas |
Middletown, CT |
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23,649
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Apr. 12, 1859
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Pump
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Benjamin Douglas |
Middletown, CT |
Co-inventor William Douglas was deceased by the time the patent was issued. The patent is an improvement to patent 2,895, specifically to the method of attaching the pump barrel to the base and to the water pump, all to improve ease of installation and maintenance. |
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Pump
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William Douglas |
Middletown, CT |
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30,603
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Nov. 06, 1860
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Pump
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Benjamin Douglas |
Middletown, CT |
Improvements to the check valve to improve water flow out the horizontal discharge pipe. |
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33,299
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Sep. 17, 1861
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Improvement in pumps
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Benjamin Douglas |
Middletown, CT |
This pump stand is intended for the pump of patent 30,603 and is intended for use while washing windows, watering flowers, etc. |
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35,059
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Apr. 22, 1862
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Improvement in pumps
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Joseph W. Douglas |
Middletown, CT |
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35,802
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Jul. 01, 1862
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Improvement in pumps
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Benjamin Douglas |
Middletown, CT |
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38,444
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May. 05, 1863
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Improvement in pumps
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Joseph W. Douglas |
Middletown, CT |
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56,671
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Jul. 24, 1866
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Improvement in pumps
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Joseph W. Douglas |
Middletown, CT |
The improvement is a double-acting pump with only one side pipe, which is achieved by using a hollow piston-rod for the other pipe. |
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64,292
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Apr. 30, 1867
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Improvement in hose-couplings
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Joseph W. Douglas |
Middletown, CT |
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68,781
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Sep. 10, 1867
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Improved snap-hook
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Henry S. North |
Middletown, CT |
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74,321
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Feb. 11, 1868
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Improvement in pumps
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Joseph W. Douglas |
Middletown, CT |
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81,611
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Sep. 01, 1868
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Grindstone Frame
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Joseph W. Douglas |
Middletown, Middlesex County, CT |
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85,434
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Dec. 29, 1868
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Improved compound for extinguishing fires
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Thomas Drew |
Newton, MA |
There is no patent drawing. This patent is referenced in patent 97,894, which covers a chemical fire extinguisher manufactured by W. & B. Douglas Mfg. Co. |
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93,974
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Aug. 24, 1869
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Improvement in knapsack-engine
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Joseph W. Douglas |
Middletown, CT |
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97,767
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Dec. 14, 1869
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Improvement in pumps
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Joseph W. Douglas |
Middletown, CT |
"The invention consists in lining the air-chamber and the contiguous passages of pumps and hydraulic rams, and their equivalents, with a lining of porcelain or earthen material, which shall prevent the metal from rusting, and preserve, at the same time, the water from being diffused with particles of iron-rust and colored, and thus deteriorated." |
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97,894
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Dec. 14, 1869
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Improved apparatus for extinguishing fires by means of chemical agents
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Joseph W. Douglas |
Middletown, CT |
"When it is desired to use such a chemical as does not evolve gas till thrown with the water upon the fire, that which forms the subject of patent 85,434, dated December 29, 1868, may be used." |
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98,674
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Jan. 11, 1870
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Improvement in adjustable attachment of pump-barrels to their bases
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Joseph W. Douglas |
Middletown, CT |
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102,664
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May. 03, 1870
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Improvement in pump-valves
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Joseph W. Douglas |
Middletown, CT |
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134,294
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Dec. 24, 1872
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Improvement in rotary pumps
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Erwin Lavens |
Middletown, CT |
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Improvement in rotary pumps
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James C. Lamb |
Middletown, CT |
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144,965
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Nov. 25, 1873
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Improvement in pumps
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Joseph W. Douglas |
Middletown, CT |
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151,364
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May. 26, 1874
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Improvement in the construction of pump-gearing
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Joseph W. Douglas |
Middletown, CT |
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158,786
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Jan. 19, 1875
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Lining pump cylinders
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Joseph W. Douglas |
Middletown, CT |
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166,195
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Aug. 03, 1875
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Improvement in water-hydrants
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Joseph W. Douglas |
Middletown, CT |
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173,601
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Feb. 15, 1876
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Improvement in vehicle-wheels
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Joseph W. Douglas |
Middletown, CT |
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192,979
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Jul. 10, 1877
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Improvement in portable pumps
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Joseph W. Douglas |
Middletown, CT |
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244,384
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Jul. 19, 1881
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Pump
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Joseph W. Douglas |
Middletown, CT |
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279,360
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Jun. 12, 1883
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Combined Drill or Reamer, Tap and Socket
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Joseph W. Douglas |
Middletown, Middlesex County, CT |
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280,146
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Jun. 26, 1883
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Cutter and Holder for Lathes
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Joseph W. Douglas |
Middletown, Middlesex County, CT |
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280,147
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Jun. 26, 1883
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Cutter and Holder for Lathes, &c.
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Joseph W. Douglas |
Middletown, Middlesex County, CT |
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280,148
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Jun. 26, 1883
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Cutter and Holder for Lathes, &c.
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Joseph W. Douglas |
Middletown, Middlesex County, CT |
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294,210
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Feb. 26, 1884
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Pump
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Joseph W. Douglas |
Middletown, CT |
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306,679
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Oct. 14, 1884
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Pump
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Joseph W. Douglas |
Middletown, CT |
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321,804
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Jul. 07, 1885
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Lever Shears
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Joseph W. Douglas |
Middletown, Middlesex County, CT |
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386,115
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Jul. 17, 1888
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Telescopic stop-cock for water-service
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Edward Douglas |
Middletown, CT |
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