Petrolfree Inc

3 patents in this archive

• Method and apparatus for controlling an electric motor and an internal combustion engine

  US8720389B2 · 2014 · original assignee · indexed by metadata only

• Method and apparatus for controlling an electric motor

  US8141523B2 · 2012 · original assignee · indexed by metadata only

• Method and apparatus for controlling an electric motor

  US20100051449A1 · 2010 · original assignee