...Sound Techniques are designing and re-building brands that I love...
There's a lot to love about those desks for sure. Some truly great sounding albums were recorded at studios with a Sound Techniques 'A' Range.
They also happen to look very sexy so I can absolutely understand that Danny would want to capture that look by using quadrant faders and Ernest Turner type meters.
Filing trademarks associated with the products you're building is all part of protecting your business and certainly not unusual in my opinion.
Think about the kind of money that's probably needed for R&D/tooling costs and everything else involved in recreating those faders!