Ballard v. City of Pittsburgh

The bill in this case is founded upon three patents, all of which are alleged to have been infringed by the respondent : (1) -Letters patent to Turner Cowing, assignor to Tallmadge E. Brown, No. 101,590, dated April 5, 1870, for “improvement in wood pavement.” (2) Letters patent to William W. Ballard and Burén B. Waddell, (who assigned his right to Ballard,) No. 94,062, dated August 24, 1869, for “improved wood pavement.” (3) Letters patent to the same persons last named, (Waddell having assigned his interest in the invention to Ballard,) No. 94,063, dated August 24, 1869, for “improved mode…