This discussion mentions the patent for the "Jack Frost" hybrid tea rose. Here is a link to the patent:
https://patents.justia.com/patent/PP7382
It is indeed a hybrid tea, I have owned two (purchased from a Carlton Rose Nurseries distributor, which came with patent tags). It is a white (not "white blend" color). I've been searching in vain for another one, but have found only the same "misinformation" about the characteristics (and no true original "Jack Frosts" available anywhere.) But wanted to take the time to give you first hand information.