American motoring publication Car and Driver discovered the application to the US Patent and Trademark office. Of course, it is all just speculation at this stage and Lexus may be thinking of producing an entirely new plug-in hybrid or range-extending hybrid in the future for the ES300.
Either way, providing a 'h' model in the US could ramp up Lexus sales even further, even though Lexus sits as the top selling luxury car brand in the US, ahead of both BMW and Mercedes-Benz. The US loves hybrid cars and Lexus already attaches a 'h' suffix to almost every model to capitalise on this.
It's too early to tell if the ES300h model will in fact feature the same 2.4-litre hybrid setup as the Toyota Hybrid Camry - Toyota and Lexus may want to provide a higher specification petrol engine for the premium model. We'll keep you updated.