Patent ID: 8104238

Claim:
A window spacer, comprising: an elongated housing defined by a base, two sidewalls, two top surfaces and two flanges extending downwardly from said top surfaces and forming a spacing therebetween, said housing further having a first distal end and a second distal end and being bent upon itself so that said first distal end is adjacent said second distal end; an engaging slot in said first distal end; an engaging member formed in said second distal end, said engaging member including a pair of angled restraining portions separated from one another by a gap and being planar with said two top surfaces of said second distal end, said angled restraining portions and said gap being extensions of said top surfaces and said spacing; wherein when said engaging member is inserted into said engaging slot, a restraining portion of said engaging member prevents said engaging member from disengaging from said engaging slot; an extension ending with a tab on one of said first and second distal ends, said extension dimensioned so as to substantially seal off the other of said first and second distal ends; and at least two other tabs on said other of said first and second distal ends, said at least two other tabs being separated by a gap dimensioned to receive said tab of said extension, wherein when said at least two other tabs and said tab of said extension are in a touching relationship, said distal ends are aligned such that substantially the only opening in said window spacer is said spacing.