Patents Assigned to Shoe Spring, Inc.
  • Spring cushioned shoe
    Patent number: 6886274
    Abstract: A sole assembly for an article of footwear comprises a sole having a heel region and a ball region. A first multi-turn wave spring disposed within the sole comprises an upper turn and a lower turn. The upper turn is in pivotal contact with the lower turn to define a first side and an opposing second side of the multi-turn wave spring. Compression of the first side causes expansion pressure on the second side and compression of the second side causes expansion pressure on the first side to provide cushioning and energy return responsive to a rolling footstrike.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: May 3, 2005
    Assignee: Shoe Spring, Inc.
    Inventors: David S. Krafsur, Francis E. LeVert
  • Fluid flow system for spring-cushioned shoe
    Patent number: 6665957
    Abstract: A fluid flow system for a spring-cushioned shoe is disclosed. The sole of the shoe includes a vacuity, a spring disposed within the vacuity, and a fluid passageway in fluid communication with the vacuity. The fluid flow passageway allows fluid, such as air, to escape the vacuity when the volume of the vacuity is reduced during a foot strike.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: December 23, 2003
    Assignee: Shoe Spring, Inc.
    Inventors: Francis E. Levert, David S. Krafsur
  • Spring cushioned shoe
    Publication number: 20030163933
    Abstract: A sole assembly for an article of footwear comprises a sole having a heel region and a ball region. A first multi-turn wave spring disposed within the sole comprises an upper turn and a lower turn. The upper turn is in pivotal contact with the lower turn to define a first side and an opposing second side of the multi-turn wave spring. Compression of the first side causes expansion pressure on the second side and compression of the second side causes expansion pressure on the first side to provide cushioning and energy return responsive to a rolling footstrike.
    Type: Application
    Filed: February 20, 2003
    Publication date: September 4, 2003
    Applicant: Shoe Spring, Inc.
    Inventors: David S. Krafsur, Francis E. LeVert
  • Shock resistant shoe
    Publication number: 20030126760
    Abstract: A sole assembly for a shock resistant shoe includes a sole having a heel region and a ball region. A first cone spring, disposed within the sole, includes a large diameter terminal end and an opposing small diameter terminal end. The large diameter terminal end is disposed above the small diameter terminal end.
    Type: Application
    Filed: January 2, 2003
    Publication date: July 10, 2003
    Applicant: Shoe Spring, Inc.
    Inventors: Francis E. LeVert, David Krafsur
  • Spring cushioned shoe
    Publication number: 20020174567
    Abstract: A spring cushioned shoe is disclosed. The shoe includes a sole assembly that has a first spring disposed within a vacuity in the heel portion of the assembly, and a second spring disposed within a vacuity in the ball portion of the assembly. The springs are, e.g., wave springs that extend vertically from the upper to the lower internal boundaries of the vacuities.
    Type: Application
    Filed: July 10, 2002
    Publication date: November 28, 2002
    Applicant: Shoe Spring, Inc.
    Inventors: David Krafsur, Francis LeVert
  • Spring cushioned shoe
    Patent number: 6282814
    Abstract: A spring cushioned shoe is disclosed. The shoe includes a sole assembly that has a first spring disposed within a vacuity in the heel portion of the assembly, and a second spring disposed within a vacuity in the ball portion of the assembly. The springs are, e.g., wave springs that extend vertically from the upper to the lower internal boundaries of the vacuities.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: September 4, 2001
    Assignee: Shoe Spring, Inc.
    Inventors: David S. Krafsur, Francis E. LeVert