Last month, Mentor raised its bid to $14 a share for 2.1 million shares.
That doesn't mean he won't have to raise his bid, however.
The two initially offered $160,000 but quickly raised their bid.
Each day he checked back and often raised his bid.
He did not want to raise his bid, thinking that paying more than $56 a share was too much.
It was not immediately clear how much, if at all, the Bass group might raise its bid.
At £25,000 he hesitated for the first time and raised his bid by £500.
The Swiss drug company later in the day raised its bid to $76 a share.
But he is wary of being talked into raising his bid.
But they chose to simply raise their bid to $39 instead.
