Patents by Inventor David W. Worthey

David W. Worthey 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).

  • Silicon-nitride-containing separating layer having high hardness
    Patent number: 9625213
    Abstract: The invention relates to a shaped body comprising a substrate with a firmly adhering separating layer, wherein the separating layer comprises 92-98 wt. % silicon nitride (Si3N4) and 2-8 wt. % silicon dioxide (SiO2) and wherein the separating layer has a total oxygen content of ?8 wt. % and a hardness of at least 10 HB 2.5/3 according to DIN EN ISO 6506-1.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: April 18, 2017
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Krishna Uibel, David W. Worthey
  • SILICON-NITRIDE-CONTAINING INTERLAYER OF GREAT HARDNESS
    Publication number: 20140272748
    Abstract: The invention relates to a shaped body comprising a substrate with a firmly adhering separating layer, wherein the separating layer comprises 92-98 wt. % silicon nitride (Si3N4) and 2-8 wt. % silicon dioxide (SiO2) and wherein the separating layer has a total oxygen content of ?8 wt. % and a hardness of at least 10 HB 2.5/3 according to DIN EN ISO 6506-1. The invention further relates to a process for producing such a shaped body, a coating suspension for use in such a process and the use of a shaped body according to the invention in the field of corrosive nonferrous metal melts.
    Type: Application
    Filed: August 2, 2012
    Publication date: September 18, 2014
    Applicant: ESK CERAMICS GMBH & CO. KG
    Inventors: Krishna Uibel, David W. Worthey