This lock, described on pp.173-4 contains several footnotes referring to important patents but there are no patent references in the Notes (p. 349). Rather they refer to patent lawsuit records or other publications commonly not available to the average reader.
‘…a design by Charles O. Yale.’ FN #46. This patent is US174996 to Yale issued 21 March 1876 & assigned to Herring & Co.
‘…with improvements by Jacob Weimar.’ FN #47. This is patent US210070 issued 19 November 1878 & assigned to Herring & Co.
‘As was common…Herring seems to have begun producing its Infallible prior to the patent award. This led to what was…the first time lock patent lawsuit, filed by Sargent & Greenleaf in December 1875 immediately after receiving a patent reissue.’ FN #49. This is Reissue USRE6787 issued 7 December 1875 to S W Hollen & assigned to James Sargent.
Jack