Go to PAIR. Search for patent 5809336. Look on continuity tab. Take note of reexam 90/010551. That was the rejected reexam. System does not provide link to the rejected reexam. Take note of reexam 90/010562 (the 148 patent). System does not provide a link for that either. If you look at patent 6598148 and go to continuity, again no link to reexam 90/010562. Odd isn't it.
Probably playing with our minds.
Opty