Patents by Inventor Leonard D. Isban

Leonard D. Isban 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).

  • Interior reinforcing structure for a door and method of installing an interior reinforcing structure in a door
    Patent number: 9790734
    Abstract: A reinforcing structure for a door includes a first region constructed from a first grade of corrugated paperboard and second and third regions constructed from a second grade of corrugated paperboard. The first region may be expandable and the second and third regions may be non-expandable. A method for installing the reinforcing structure in a door having a frame and two opposed skins with recessed areas includes installing the reinforcing structure on the surfaces of the recessed areas between the skins.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: October 17, 2017
    Assignee: American Containers, Inc.
    Inventors: Leonard D. Isban, Philip E. Brumbaugh
  • Hollow door construction using an improved void filler
    Patent number: 5167105
    Abstract: An improved hollow paneled door construction using an improved void filler that is expandable and which has components of a specific thickness except for relieved sections of reduced thickness to overlie the panels between the doorskins.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: December 1, 1992
    Assignee: American Containers, Inc.
    Inventors: Leonard D. Isban, Michael A. Isban