Patent ID: 8266851

Claim:
A mullion system providing improved structural rigidity comprising: a) a first component for being fastened to a frame of a first window unit, the first component having a distal end; b) a second component for being fastened to a frame of a second window unit, the second component having a distal end; c) a removably attachable unibody reinforcement key configured for joining the first component to the second component, wherein the unibody reinforcement key comprises a U-shaped member with a cross bar portion and oppositely disposed arms extending from the cross bar portion, the cross bar portion extending beyond the distal ends of the first component and the second component and configured for receipt in a securement member, the oppositely disposed arms extending into the distal ends of the first and second components; and d) a gusset plate for attachment to the distal ends of the first and second components, the gusset plate further comprising at least one aperture therein for receiving the cross bar portion of the unibody reinforcement key, the gusset plate defining the securement member.