Derek Rotondo said he felt like he was living in the 1950s when he discovered he would not be able to take advantage of JPMorgan Chase & Co.'s 16 weeks of paid parental leave once he and his wife had their second child this summer.

Rotondo discovered that his company considered him a “secondary caregiver” and was only entitled, then, to two weeks of paid leave. JPMorgan's human resources department, he said, told him “birth mothers are what we consider primary caregivers.”

Those claims were made against JPMorgan in a new case filed in Ohio with the U.S. Equal Employment Opportunity Commission on Thursday. The charge was filed by the law firm Outten & Golden and the American Civil Liberties Union of Ohio on behalf of all fathers who are subject to the policy. The lawyers involved in Rotondo's case said they estimated it could affect hundreds of thousands of workers. JPMorgan's parental leave policy, they alleged, discriminates using sex-based stereotypes.