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Re:Notifications in iOS 12 by cgy1 on Thursday June 14, 2018 @12:07PM (#17312655)
I would guess patents held by Google regarding their notifications interactions are part of it.
Re:Notifications in iOS 12 by microcolonel on Thursday June 14, 2018 @12:20PM (#17312770)
Isn't this the only one? https://patents.google.com/patent/US20090249247A1/en

AFAICT, Android never even incorporated the designs in this patent.