Patent ID: 7484811

Claim:
An orthopedic chair, comprising: a chair frame having support members; a fabric stretched between the support members of the chair frame having a load bearing surface for supporting a person in a sitting position, wherein the fabric has greater than or equal to one layer(s) (L n ). wherein n=0, −1, −2, . . . −i, wherein n=0 represents the greater than or equal to one layer(s) (L n ) of the load bearing surface that contacts the load, wherein n=−1, −2, . . . −i, represents successive underlying greater than or equal to one layer(s) (L n ) of the load bearing surface, wherein n=−i, represents a bottom underlying greater than or equal to one layer(s) (L n ) of the load bearing surface, wherein the fabric consists essentially of a polyurethane fiber and a fiber that is chemically different from the polyurethane fiber, and wherein the fabric has been stretched between members of the chair frame so that the fabric's percent elongation approaches but is less than the percent elongation for the Young's Modulus.