IIRC flying IFR into an uncontrolled field is a one-in & one-out deal.
In essence you "own" the airspace (not the runway) until you've landed
& cancelled with ATC or flown somewhere else. Only then can ATC bring
in another aircraft for an approach (assuming IMC conditions exist). I
think a parallel to a controlled field would be the local controller
sterilizing the airspace of any special VFRs aircraft when IAPs are in
effect.

Steven P. McNicoll wrote:

Being IFR or VFR has nothing to do with "owning" the runway.