Mostek, Dozier,Richter, have been looked at exhaustively..

I just paged thru Pubpat's & NEC's original '336 Reexam Requests and saw no mention of Richter, nor Dozier for that matter..

Pubpat notes: Ledzius, Mead & Conway, Kato, Crosby, Hotta, Magar, Antonaccio, Schaire..

http://photos.imageevent.com/banos/uspto/PubPat_s%20336%20reexam%20request.pdf

Nec notes: Ledzius, Mostek, Guttag, Thaden, Boney, Hitachi, Hanamura, Brenig, Kronlage, Parker

http://imageevent.com/banos/uspto?p=16&n=15&m=14&c=2&l=0&w=4&s=0&z=3

I do not have a copy of the third original (Toshiba?) '336 reexam Request (and am at work and cannot dig it up).. perhaps this is where Richter & Dozier are specifically mentioned as you state they have been looked at.. if someone can find this & post, it would be very helpful & greatly appreciated..