Before you start your patent search, here's some tips for you for an an effective patent searching.
Brainstorm on terms that describe the invention.
Search for relevant terms related to the subject matter.
Verify The relevancy of terms retrieved.
Establish the scope of the relevant classifications to distiguish the most relevant from the least relevent.
Funnily enough, a few months ago I stumbled upon a very detailed account of Selden, his work, his patents and legal battles against his competitors:
Selden is another historical figure that some contemporary articles like to paint as a historical example of a "patent troll", but this account suggests otherwise. He does ...