Patent ID: 7972455

Claim:
A method of forming a hem at the edge of an elastic material, comprising: laying a first stretch fabric sheet upon a second stretch fabric sheet; forming a stitch line adjacent to an edge of said first and second stretch fabric sheets to join said first and second stretch fabric sheets together; ultrasonically cutting an excess edge strip from both said first and second sheets along a fuse line and thereby simultaneously ultrasonically fusing said sheets together along said fuse line and thereby removing the stitch line; positioning an elastic strip between the first and second sheets along said fuse line by opening said first and second sheets, laying an elastic strip along said fuse line and folding said second stretch fabric sheet about said elastic strip to sandwich said elastic strip between said first and second sheets; and fusing said elastic strip to at least one of said first or second sheet to form a hem, the hem being a portion of an edge of a breast cup of a brassiere.