Patents by Inventor David Glaess

David Glaess 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).

  • Multi-layer PZT microactuator having a poled but inactive PZT constraining layer
    Patent number: 9741376
    Abstract: A multi-layer piezoelectric microactuator assembly has at least one poled and active piezoelectric layer and one poled but inactive piezoelectric layer. The poled but inactive layer acts as a constraining layer in resisting expansion or contract of the first piezoelectric layer thereby reducing or eliminating bending of the assembly as installed in an environment, thereby increasing the effective stroke length of the assembly. Poling only a single layer would induce stresses into the device; hence, polling both piezoelectric layers even though only one layer will be active in use reduces stresses in the device and therefore increases reliability.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: August 22, 2017
    Assignee: Magnecomp Corporation
    Inventors: Kuen Chee Ee, Long Zhang, Peter Hahn, David Glaess
  • Variable fresnel screen for use in projection device
    Patent number: 7341353
    Abstract: A thin rear projection television using a wide angle lens system is provided. In an embodiment, a fresnel screen is used in which there are at least two spatial zones in the screen with different properties. The at least two zones may be adapted to compensate for the variation in input angle.
    Type: Grant
    Filed: January 6, 2004
    Date of Patent: March 11, 2008
    Assignee: InFocus Corporation
    Inventors: Mark D. Peterson, David Glaess, Jeffrey Alan Gohman
  • Variable fresnel screen for use in projection device
    Publication number: 20040227990
    Abstract: A thin rear projection television using a wide angle lens system is provided. In an embodiment, a fresnel screen is used in which there are at least two spatial zones in the screen with different properties. The at least two zones may be adapted to compensate for the variation in input angle.
    Type: Application
    Filed: January 6, 2004
    Publication date: November 18, 2004
    Inventors: Mark D. Peterson, David Glaess