Insulated window assembly with internal muntin bars and method of making same

An insulated window assembly comprising:

• first and second spaced apart panes of transparent sheet material;
• a perimeter spacer bar positioned between said panes and extending around the perimeter of said panes and defining two pairs of opposite sides of said window assembly;
• an internal muntin bar grid disposed between said first and second spaced apart panes, said muntin bar grid being formed from a nonmetallic material which is low in thermal conductive to limit heat transfer between said first and second spaced apart panes and
• adhesive means securing said muntin bar grid to only one of said first and second panes whereby said panes may expand apart without stressing said muntin bar grid and stressing said adhesive means.

An insulated window assembly comprising:

• first and second spaced apart panes of transparent sheet material;
• a perimeter spacer bar positioned between said panes and extending around the perimeter of said panes and defining two pairs of opposite sides of said window assembly;
• an internal muntin bar grid disposed between said first and second spaced apart panes, said muntin bar grid being formed from a silicone foam material which is low in thermal conductivity to limit heat transfer between said first and second spaced apart panes, and is high in flexibility to allow for bending when forming curved shapes, and
• external wood muntin bars being secured to said first and second panes in superimposed relationship relative to said internal muntin bar grid.

An insulated window assembly comprising:

• first and second spaced apart panes of transparent sheet material;
• a perimeter spacer bar positioned between said panes and extending around the perimeter of said panes and defining two pairs of opposite sides of said window assembly;
• an internal muntin bar grid disposed between said first and second spaced apart panes, said muntin bar grid being formed from a nonmetallic material which is low in thermal conductivity to limit heat transfer between said first and second spaced apart panes, and is high in flexibility to allow for bending when forming curved shapes, and
• said muntin bar grid being U-shaped and including a base and oppositely disposed legs having outer ends positioned closely adjacent one of said first and second panes and with said base being positioned closely adjacent said other of said panes, said oppositely disposed legs of said U-shaped muntin bar being resilient to pressure from said first and second panes, said resilient legs being adapted to depress and deflect laterally under pressure from said panes moving towards each other whereby further movement of said panes is limited by said base.