In the Sperry case file, there are several documents attesting to a squabble over patents for the application of the gyrocompass to ships. Sperry obtained patents for his gyrocompass first in England, and later in the United States. In England, he was met with opposition by Anschutz-Kaempfe, though he did succeed in acquiring patents in London. Anschutz-Kaempfe was in possession of U.S. patents before Sperry himself acquired the same.
The following documents are two United Kingdom patents issued to Sperry, #15,669 and #15,679.