WILMINGTON, Del. - A creditor in the Chapter 11 bankruptcy case of Revstone Industries LLC on Feb. 18 filed a brief in the U.S. Bankruptcy Court for the District of Delaware objecting to 21 claims filed against the bankruptcy estate by the Pension Benefit Guaranty Corp. (PBGC) (In Re: Revstone Industries LLC, No. 12-13262, Chapter 11, D. Del. Bkcy.).