Harvard negotiators and representatives of the Patrolmen's Association, the University police force union, made "no progress" toward an agreement on a new police contract at a mediation session held in Boston yesterday, Lawrence Letteri, the union's president, said last night.

Letteri said the meeting, which lasted for an hour and a half, was devoted to "going over old demands," and ended earlier than he expected when Harvard representatives had to leave for other appointments.

Edward W. Powers, the University's director of employee relations and chief labor negotiator, said yesterday, "The meeting didn't last long and we didn't reach an agreement."

Powers said another negotiating session is scheduled for a week from today.

The 49 patrolmen in the union have been working without a contract since June 30, when a two-year pact expired. A state mediator was asked to assist in the negotiations in the late summer, after months of talks resulted in a stalemate.