About 2 Trademarks found that are owned by Stirling Power Systems Corporation

Auxiliary Power Systems and Accessories Therefor for Use in Supplying Electrical Power in Recreational Vehicles-Namely, an Engine-Generator Unit for Supplying Electricity for Use in the Recreational Vehicle, an Electrical Control Unit for Controlling Flow of Electrical Energy from Either the Engine-Generator Unit or an External Source of Electricity to Electrical Appliances, and a Battery Charger/Inverter

Applicant disclaims the words "Power Systems" apart from the mark as shown.

Stirling Engines