Patent ID: 6402879
Filing Date: 2002-06-11
Classification: A43B,A63B,B29D,Y10T

Abstract:
A method of forming a footwear bladder for providing cushioning for an article of footwear, said method comprising the steps of:providing first, second, third, and fourth sheets of barrier material, each said sheet having a peripheral edge; positioning said second and third sheets between said first and fourth sheets such that said second sheet is adjacent said first sheet and said third sheet is adjacent said fourth sheet, said second and third sheets being positioned such that at least a portion of each of said second and third sheets extends within the peripheral edge of each of said first and fourth sheets; configuring a sealed chamber for containing a fluid, said configuring step including securing said first and second sheets together proximate the peripheral edge of said first sheet, securing said third and fourth sheets together proximate the peripheral edge of said fourth sheet, and forming an inverted seam on a sidewall of said bladder and between said second and third sheets, said forming step including securing said second and third sheets together at locations spaced inwardly from said peripheral edges of said first, second, third and fourth sheets.