Cornell University Provost Robert A. Plane yesterday served about 100 antiwar demonstrators with an injunction restraining them from further occupation of Carpenter Hall which the demonstrators had seized Wednesday, in protest of Cornell's Defense Department Research.

The Cornell University police left area at around 6 p.m. to give the students an opportunity to leave the building which houses the engineering library. At 7 p.m. following the one-hour grace period the demonstrators were still occupying the hall, and had apparently no intention of leaving.

Official university spokesman said last night that there were no immediate plans to enforce the injunction.

Farlier in the afternoon, 200 counter demonstrators presented Plane with a petition protesting the denial of free access to the building.

At Columbia, students sitting in at Kent Hall voted to leave the building in order to attend a mass meeting carried by strikers.

On Thursday, members of the Students Majority Coalition, anti-strike group "liberated" two buildings from strikers who had occupied the buildings since Wednesday.

At the University of Pennsylvania yesterday, a few students remained in College Hall which houses university President Martin Meyerson's offices. On Wednesday night, 50 people took over the building, demanding the end of ROTC on campus and the divestiture of University-owned stock in military-industrial corporations.

university spokesmen said yesterday that the demonstrators were quiet and peaceful and that no attempts were being made of evict them