Patents by Inventor David Krafsur

David Krafsur has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cushioning apparatus for ambulatory use
    Patent number: 8065817
    Abstract: According to the principles of the first embodiment of the present invention, a midsole of a shoe comprising an integral midsole, an outer sole with transparent discs, a board last of tractable stiffness; a mechanical spring located within the midsole; and, an upper shoe body. The shoe being capable of providing line-of-sight viewing of the internally mounted contrivances for structural monitoring throughout the life of the shoe so as to improve durability, process of making comfort and acceptability.
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: November 29, 2011
    Inventors: Francis Edward LeVert, David Krafsur
  • Cushioning apparatus for ambulatory use
    Publication number: 20100199517
    Abstract: According to the principles of the first embodiment of the present invention, a midsole of a shoe comprising an integral midsole, an outer sole with transparent discs, a board last of tractable stiffness; a mechanical spring located within the midsole; and, an upper shoe body. The shoe being capable of providing line-of-sight viewing of the internally mounted contrivances for structural monitoring throughout the life of the shoe so as to improve durability, process of making comfort and acceptability.
    Type: Application
    Filed: February 11, 2009
    Publication date: August 12, 2010
    Inventors: Francis Edward LeVert, David Krafsur
  • Shock resistant shoe
    Patent number: 7441347
    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: Grant
    Filed: July 1, 2005
    Date of Patent: October 28, 2008
    Inventors: Francis E. LeVert, David Krafsur
  • Process for improving fatigue life in spring-cushioned shoes
    Publication number: 20050247385
    Abstract: A process for reducing heat transfer within a spring in a spring cushioned shoe, said process comprises the steps of applying a residual compressive stress to said spring, for example by shot peening, and then mounting the spring between an inner sole and an outer sole of the shoe.
    Type: Application
    Filed: July 20, 2005
    Publication date: November 10, 2005
    Inventors: David Krafsur, Francis Levert
  • Shock resistant shoe
    Publication number: 20050241184
    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: July 1, 2005
    Publication date: November 3, 2005
    Inventors: Francis LeVert, David Krafsur
  • Fluid flow system for spring-cush
    Publication number: 20050126040
    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: Application
    Filed: January 31, 2005
    Publication date: June 16, 2005
    Inventors: Francis LeVert, David Krafsur
  • Spring cushioned shoe
    Publication number: 20050126039
    Abstract: A sole assembly for an article of footwear comprises a midsole, a sole having a heel region, and a first wave spring disposed within a vacuity located within the heel region. The wave spring includes a top surface and a bottom surface. A plate, resting upon the top surface of the wave spring, is unsecured to the midsole and sized to permit movement within the vacuity along with the wave spring responsive to a rolling footstrike.
    Type: Application
    Filed: January 31, 2005
    Publication date: June 16, 2005
    Inventors: Francis LeVert, David Krafsur
  • 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