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CA Patent: CA-2,257
Machine for dressing flour
Middlings purifier
George Thomas Smith - Minneapolis, MN

USPTO Classifications:

Tool Categories:
agricultural machines : fanning mills


Geo. T. Smith Middlings Purifier Co. - Jackson, MI


Patent Dates:
Granted: Apr. 18, 1873

Patent Pictures:
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The invention is a method of separating bran from the rest of the flour when the flour has been very finely ground and "it is difficult to separate it from the flour by the ordinary methods of bolting", which rely on a current of air passing above the flour. Smith's invention uses a series of brushes, air channels and dampers to more effectively remove the small particles of bran.

The inventor sued John Goldie et. al., of the Galt, Ontario firm of Goldie & McCulloch. The court found this patent to be valid and patents CA-1,739 and CA-1,793 referenced by Goldie's defense were not valid. The defendants were ordered to produce a list of every purchaser of their infringing machine and the price charged, and the profits made, and to pay damages as determined by the Court of Chancery, plus costs.

An ad in August 1883 "The United States Miller" from the Geo. T. Smith Middlings Purifier Co., Jackson, Michigan, includes a notice that "we have purchased all patents related to Purifiers, lately owned by Huntley, Holcomb & Heine, including the well-known Middleton Patent and its several re-issues." The ad says that they made fourteen sizes of middlings purifiers.

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