Patents by Inventor David L. Bernard

David L. Bernard 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).

  • Method for dry etching fluid feed slots in a silicon substrate
    Patent number: 7271104
    Abstract: A method of micro-machining a semiconductor substrate to form one or more through slots therein. The semiconductor substrate has a device side and a fluid side opposite the device side. The method includes diffusing a p-type doping material into the device side of the semiconductor substrate in one or more through slot locations to be etched through a thickness of the substrate. The semiconductor substrate is then etched with a dry etch process from the device side of the substrate to the fluid side of the substrate so that one or more through slots having a reentrant profile are formed in the substrate.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: September 18, 2007
    Assignee: Lexmark International, Inc.
    Inventors: David L. Bernard, John W. Krawczyk, Andrew L. McNees
  • Foamed polyisocyanurates
    Patent number: 4405725
    Abstract: Foams having improved flammability characteristics are prepared by reacting a polyaryl polyalkylene polyisocyanate with 2 to 15 parts of an active hydrogen compound having a molecular weight of from about 350 to about 10,000 and from one to six active hydrogen containing groups as determined by the Zerewitinoff method in the presence of a blowing agent, a stabilizer and a catalyst.
    Type: Grant
    Filed: July 20, 1977
    Date of Patent: September 20, 1983
    Assignee: Mobay Chemical Corporation
    Inventors: David L. Bernard, John K. Backus, Anthony J. Doheny, Jr.