A federal judge has granted final approval of a $28.8 million settlement — and an attorney fees award of $7.5 million — in a class action antitrust suit against office supply giant 3M, and lawyers say that another large, class action settlement by 3M is in the final stages of negotiations.

The pair of class action suits directly stemmed from a prior suit, LePage’s Inc. v. 3M, which resulted in a $68 million verdict in 1999 and a finding that 3M had set out to monopolize the market for transparent tape.