It follows that IH is patenting PH
Yes, I agree. Makes sense too, as Hagelstein is now part of the IH Team. There is an "IH Group" photo from ICCF21, with him included. Also, in the IH/Rossi court documents, there is mention of PH flying down to North Carolina to help them out.
I believe they offered $ to Swartz to join also, but he turned it down.