Patent ID: 8910999

Claim:
A vehicle door assembly comprising: an inner panel including: a substantially rectangular frame portion having a continuous perimeter integrally formed by upper and lower horizontal beams interconnected by front and rear upright beams; a single intermediate upright beam extending between said upper and lower horizontal beams of said frame portion; and an outer panel attached to said inner panel; said frame portion comprising opposite front and rear U-shaped side frame members non-detachably attached to each other by upper and lower intermediate frame members so as to form a continuous perimeter; a single gusset beam non-detachably secured to said frame portion and slanted so as to extend between said front U-shaped side frame member and said upper intermediate frame member; and said side frame members made of a first steel material and said intermediate frame members made of a second steel material; said first steel material of said side frame members being different from said second steel material of said intermediate frame members; said intermediate upright beam non-detachably attached to said intermediate frame members of said frame portion at distal ends thereof; said intermediate upright beam made of a third steel material different from said second steel material of said intermediate frame members; said gusset beam made of a fourth steel material different from said second steel material of said intermediate frame members.