Florida man doesn't have much chance
Apple had a Dynabook in mind right back to the early days of the Mac. HyperCard was a Dynabookish idea wrapping up a programming language, hypertext and "rich multimedia" (sound, animation, ebooks) before the web. At the same time Apple was working on the idea of a handheld device with HyperCard like features. Both HyperCard and Apple's Dynabook which had Alan Kay's involvement date back to 1987. The Dynabook eventually became the Newton (with rounded corners). Although the Newton shipped in 1993, it had been touted before that time and of course there was the Psion Organiser, that dated from 1984 and the Psion Series 3 from 1991.
It's fairly clear that not just Apple but a number of organisations can claim prior art over this dweeb's patent.