Found:

Case Filter

SYNTAX: filter which requires an (overtly realized) NP argument to be case marked, or be associated with a case position. EXAMPLE: this filter rules out (i). No case is assigned to the subject position of the complement of seems; only by moving to the subject position of the matrix clause can John satisfy the case filter: it is assigned case there.

(i) a * it seems [ John to be angry ]
    b   John seems [ ti to be angry ]