Hi.
I went to great lengths to explain this to somebody else just yesterday in the post below:
https://sanctioned-suicide.net/threads/expiration-date-fentanyl.46404/#post-841251
The chart posted above on this thread comes from a harm reduction website and assumes IV'ing the drug.
Bottom line: unless you have the know how and experience to extract the Fentanyl from the patches and the guts and the know how to shoot it up you're taking a gamble i.e. best (but most unlikely) case you accomplish what you set out to do. Worst case (for your purposes): you pass out for a while, get dope sick, and live with the consequences of a failed attempt.