Inventor Richard Rhodes received the patent for a hearing aid.
Source
German inventor Ferdinand von Zeppelin granted a patent for the navigable balloon.
J. L. Love patented his pencil sharpener in the US.
Swedish-American inventor John Ericsson patented the screw propeller design.
Inventor Fred Waller patented the aquaplane, which would become water skis.
Inventor Elias Howe was awarded the patent for the lockstitch sewing machine.
