Patents by Inventor David J. Henry

David J. Henry 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).

  • Dual hearing protection system
    Patent number: 11963849
    Abstract: A hearing protection system is provided. The hearing protection system has a first active hearing protection system. The first active hearing protection system is level-dependent. The hearing protection system also has a second active hearing protection system. The second active hearing protection system is level-dependent. Each of the first and second active hearing protection systems are configured to operate in an independent mode and a dual-protection mode. A dual-protection mode level dependent function of the second active hearing protection system is different than an independent mode level dependent function.
    Type: Grant
    Filed: October 2, 2020
    Date of Patent: April 23, 2024
    Assignee: 3M Innovative Properties Company
    Inventors: Paul D. Henry, David L. Albean, Oscar L. Kårekull, Cameron J. Fackler, Andreas T. Andersson, Abel Gladstone Mangam
  • Truck sleeper
    Patent number: 7445271
    Abstract: A truck cab and sleeper unit are extended using a preferred stepped aerodynamic roof which at a first ceiling level corresponds to the original sleeper unit ceiling height, and which at a second ceiling level corresponds to the original sleeper unit ceiling height plus the height difference between the truck cab height and the original sleeper unit ceiling height. The original sleeper roof may be used, or a new unitary roof may be fabricated. The apparatus and method of the invention preserve all or most of the components of an original sleeper unit, while enabling rapid conversion comparable to the full replacement of the prior art.
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: November 4, 2008
    Inventor: David J. Henry
  • Truck sleeper
    Patent number: 7263754
    Abstract: A truck cab and sleeper unit are extended using a preferred stepped aerodynamic roof which at a first ceiling level corresponds to the original sleeper unit ceiling height, and which at a second ceiling level corresponds to the original sleeper unit ceiling height plus the height difference between the truck cab height and the original sleeper unit ceiling height. The original sleeper roof may be used, or a new unitary roof may be fabricated. The apparatus and method of the invention preserve all or most of the components of an original sleeper unit, while enabling rapid conversion comparable to the full replacement of the prior art.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: September 4, 2007
    Inventor: David J. Henry