Patents by Inventor David T. Henry

David T. 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
  • Process for producing polymers with multimodal molecular weight distributions
    Patent number: 5648438
    Abstract: The invention provides a continuous process for catalytically polymerizing a monomer feed of ethylene and at least one comonomer which comprises introducing a catalyst including a bulky ancillary ligand transition metal compound and monomer feed in an upstream reaction zone for polymerization, introducing further catalyst in a downstream reaction zone for further polymerization, the peak temperature in the downstream reaction zone being at least 50.degree. C. higher than in the upstream zone and being above 150.degree. C. The process economically produces polymer of good properties which is melt processable.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: July 15, 1997
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: David T. Henry, Doulgas J. McLain, Joseph D. Domine, Aspy Keki Mehta, William Joseph Zafian, Norbert Baron, Bernard J. Folie