IBM method and computer program product for displaying objects from overlapping windows
IBM fought hard for this patent and even pushed the EPO Technical Board of Appeal to create a precedent in 1998 for violating Art 52 EPC in order to get claims to a "computer program product" granted. The teaching itself is abstract, functional and trivial: rearrange the contents of a partially visible window so as to fit them within the part of the window that is currently visible on the screen rather than letting part of the contents be obscured by another window. This patent fully went into force on Jan 2001 after no opposition had been filed.