I'm not sure the president of a company could be considered a technically expert witness[1]. He certainly was able to testify that TeckNow was doing text messaging long before Telefind (NTP). Whether he had a clue about he software might be questionable (my guess).
Incidentally, my memory must be failing (from too much RF). In 1978, I was working for Intech and taking on consulting contracts on the side. One was conveniently located across the road for a company called Meta Systems. They were doing text messaging pagers using an RCA COSMAC processor and a receiver partially designed by me. Text messaging was totally new at the time. However, the RFI generated by the LED display serious interfered with reception. Battery life was also miserable. It was too big. There was a patent applied for at the time... yep:
Both systems used remote terminals connected by teletype machines or computers which largely duplicates the various text messaging systems. Both these patents have expired by now. However, they are certainly prior art for text messaging. Whom do I sue???
[1] At one company I worked for, the president of the company was generally unable to operate the companies products or even explain how they worked. Company presidents are normally not techy types.