Patents by Inventor David P. Mitchell

David P. Mitchell 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).

  • Footwear with enhanced cushioning
    Patent number: 7444766
    Abstract: Footwear includes an insole of low density polyurethane and an integral border for attaching the insole to the upper and having an integral support surface for attaching a steel shank. The footwear includes the insole and two contiguous cushioning layers.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: November 4, 2008
    Assignee: Rocky Brands Wholesale LLC
    Inventor: David P. Mitchell
  • Footwear with improved insole
    Patent number: 7222443
    Abstract: Footwear includes an insole with at least one covered opening in the insole.
    Type: Grant
    Filed: March 11, 2004
    Date of Patent: May 29, 2007
    Assignee: Rocky Brands Wholesale LLC
    Inventor: David P. Mitchell
  • Shoe with insole as part sole filler and method of making same
    Patent number: 6912801
    Abstract: A method of manufacture of footwear and the footwear comprising the steps of providing a last with an upper thereon, providing a mold insert on the bottom of the last, providing a mold having a mold cavity for a tread sole, disposing the last and upper against the mold with the mold insert disposed within the mold cavity, forming a sole in the mold cavity having a depression therein in the shape of the mold insert, providing an insole with a first portion in the shape of the depression and a second portion substantially in the shape of the sole and securing the first portion of the insole in the depression. The tread sole and insole are formed of materials preferably having different physical properties. The tread sole can include one of tongues and grooves and the insole would then have the other of tongues and grooves, said tongues and grooves mating with each other.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: July 5, 2005
    Assignees: Georgia Boot LLC, Ro-Search, Inc.
    Inventors: Sven E. Oberg, David P. Mitchell
  • Shoe with insole as part sole filler and method of making same
    Patent number: 6560901
    Abstract: A method of manufacture of footwear and the footwear comprising the steps of providing a last with an upper thereon, providing a mold insert on the bottom of the last, providing a mold having a mold cavity for a tread sole, disposing the last and upper against the mold with the mold insert disposed within the mold cavity, forming a sole in the mold cavity having a depression therein in the shape of the mold insert, providing an insole with a first portion in the shape of the depression and a second portion substantially in the shape of the sole and securing the first portion of the insole in the depression. The tread sole and insole are formed of materials preferably having different physical properties. The tread sole can include one of tongues and grooves and the insole would then have the other of tongues and grooves, said tongues and grooves mating with each other.
    Type: Grant
    Filed: October 31, 1994
    Date of Patent: May 13, 2003
    Assignees: Georgia Boot LLC, Ro-Search, Inc.
    Inventors: Sven E. Oberg, David P. Mitchell
  • Shoe with insole as part sole filler and method of making same
    Publication number: 20020152561
    Abstract: A method of manufacture of footwear and the footwear comprising the steps of providing a last with an upper thereon, providing a mold insert on the bottom of the last, providing a mold having a mold cavity for a tread sole, disposing the last and upper against the mold with the mold insert disposed within the mold cavity, forming a sole in the mold cavity having a depression therein in the shape of the mold insert, providing an insole with a first portion in the shape of the depression and a second portion substantially in the shape of the sole and securing the first portion of the insole in the depression. The tread sole and insole are formed of materials preferably having different physical properties. The tread sole can include one of tongues and grooves and the insole would then have the other of tongues and grooves, said tongues and grooves mating with each other.
    Type: Application
    Filed: March 18, 2002
    Publication date: October 24, 2002
    Inventors: Sven E. Oberg, David P. Mitchell
  • Shoe with insole as part sole filler and method of making same
    Patent number: 6321464
    Abstract: A method of manufacture of footwear and the footwear comprising the steps of providing a last with an upper thereon, providing a mold insert on the bottom of the last, providing a mold having a mold cavity for a tread sole, disposing the last and upper against the mold with the mold insert disposed within the mold cavity, forming a sole in the mold cavity having a depression therein in the shape of the mold insert, providing an insole with a first portion in the shape of the depression and a second portion substantially in the shape of the sole and securing the first portion of the insole in the depression. The tread sole and insole are formed of materials preferably having different physical properties. The tread sole can include one of tongues and grooves and the insole would then have the other of tongues and grooves, said tongues and grooves mating with each other.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: November 27, 2001
    Assignee: Georgia Boot LLC
    Inventors: Sven E. Oberg, David P. Mitchell