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Manufacturers Index - P. H. & F. M. Roots
Patents
This page contains information on patents issued to this manufacturer.

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USPTO = U.S. Patent Office . Images of the actual patent can be viewed on the U.S. Patent Office web site but a special TIFF viewer must be installed with your browser in order properly work. More information on how to configure your computer to view these patents can be found at TIFF image Viewers for Patent Images.
DATAMP = Directory of American Tool And Machinery Patents . A sister site to VintageMachinery.org with information on patents related to machinery and tools. A much easier user interface than the USPTO's for finding information on machinery patents.

Patent Number Date Title Name City Description
30,157 Sep. 25, 1860 Blower P. H. Roots Connersville, IN This patent is the genesis of the famous Roots blower. Philander H. Roots applied for an extension on this patent (or rather, on the reissue of this patent), but Roots's own testimony indicated that this design was found to be virtually useless because of excessive wear. An 1866 improvement added wooden rims to the pistons, and that is the design that became successful. (The patent commissioner also noted that the reissue added new claims that could not be found in the original drawing or description, and therefore any extension would have had to disclaim those new claims.)
44,892 Nov. 01, 1864 Improvement in blower-cases P. H. Roots Connersville, IN See also patent 30,157.
56,614 Jul. 24, 1866 Improvement in cross-heads for blowers F. M. Roots Connersville, IN The original Roots blower design suffered from rapid wear of the pistons. This invention adds wooden rims to the pistons to reduce friction and wear. This alteration was apparently successful and the Roots blower sold very well afterwards.
    Improvement in cross-heads for blowers P. H. Roots Connersville, IN  
RE2,369 Oct. 02, 1866 Improvement in blowers P. H. Roots Connersville, IN See the text description for the original patent for information on Roots's application for an extension to this patent.