US Patent 7819465 Transferable B-pillar for facilitating ingress/egress

A door system includes a vehicle frame defining a door opening. A forward opening door is disposed in the door opening and has a forward edge hingedly connected to a forward support pillar and a rearward edge securely engageable with an intermediate support pillar. A rearward opening door is disposed in the door opening and has a rearward edge hingedly connected to a rearward support pillar and a forward edge securely engageable with the intermediate support pillar. A latching system has frame latches that removably attach the intermediate support pillar to the vehicle frame and door latches that removably connect the intermediate support pillar to one of the forward opening door and rearward opening door, such that the intermediate support pillar is connected to one or more of the vehicle frame, forward opening door, and rearward opening door at all times.