Patents by Inventor Todd Weisgraber

Todd Weisgraber 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).

  • Publication number: 20170057162
    Abstract: A high-resolution P?SL system and method incorporating one or more of the following features with a standard P?SL system using a SLM projected digital image to form components in a stereolithographic bath: a far-field superlens for producing sub-diffraction-limited features, multiple spatial light modulators (SLM) to generate spatially-controlled three-dimensional interference holograms with nanoscale features, and the integration of microfluidic components into the resin bath of a P?SL system to fabricate microstructures of different materials.
    Type: Application
    Filed: November 15, 2016
    Publication date: March 2, 2017
    Inventors: Christopher M. Spadaccini, Todd Weisgraber, George Farquar, Steven Gemberling, Nicholas Fang, Matthew Alonso, Jun Xu, Howon Lee
  • Patent number: 9492969
    Abstract: A high-resolution P?SL system and method incorporating one or more of the following features with a standard P?SL system using a SLM projected digital image to form components in a stereolithographic bath: a far-field superlens for producing sub-diffraction-limited features, multiple spatial light modulators (SLM) to generate spatially-controlled three-dimensional interference holograms with nanoscale features, and the integration of microfluidic components into the resin bath of a P?SL system to fabricate microstructures of different materials.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: November 15, 2016
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Christopher M. Spadaccini, George Farquar, Todd Weisgraber, Steven Gemberling, Nicholas Fang, Jun Xu, Matthew Alonso, Howon Lee
  • Publication number: 20150309473
    Abstract: A high-resolution P?SL system and method incorporating one or more of the following features with a standard P?SL system using a SLM projected digital image to form components in a stereolithographic bath: a far-field superlens for producing sub-diffraction-limited features, multiple spatial light modulators (SLM) to generate spatially-controlled three-dimensional interference holograms with nanoscale features, and the integration of microfluidic components into the resin bath of a P?SL system to fabricate microstructures of different materials.
    Type: Application
    Filed: May 31, 2011
    Publication date: October 29, 2015
    Inventors: Christopher M. Spadaccini, George Farquar, Todd Weisgraber, Steven Gemberling, Nicholas Fang, Jun Xu, Matthew Alonso, Howon Lee
  • Patent number: 8065119
    Abstract: A computerized method and system for designing an aerodynamic focusing lens stack, using input from a designer related to, for example, particle size range to be considered, characteristics of the gas to be flowed through the system, the upstream temperature and pressure at the top of a first focusing lens, the flow rate through the aerodynamic focusing lens stack equivalent at atmosphere pressure; and a Stokes number range. Based on the design parameters, the method and system determines the total number of focusing lenses and their respective orifice diameters required to focus the particle size range to be considered, by first calculating for the orifice diameter of the first focusing lens in the Stokes formula, and then using that value to determine, in iterative fashion, intermediate flow values which are themselves used to determine the orifice diameters of each succeeding focusing lens in the stack design, with the results being output to a designer.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: November 22, 2011
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Eric Gard, Vincent Riot, Keith Coffee, Bruce Woods, Herbert Tobias, Jim Birch, Todd Weisgraber
  • Publication number: 20080221842
    Abstract: A computerized method and system for designing an aerodynamic focusing lens stack, using input from a designer related to, for example, particle size range to be considered, characteristics of the gas to be flowed through the system, the upstream temperature and pressure at the top of a first focusing lens, the flow rate through the aerodynamic focusing lens stack equivalent at atmosphere pressure; and a Stokes number range. Based on the design parameters, the method and system determines the total number of focusing lenses and their respective orifice diameters required to focus the particle size range to be considered, by first calculating for the orifice diameter of the first focusing lens in the Stokes formula, and then using that value to determine, in iterative fashion, intermediate flow values which are themselves used to determine the orifice diameters of each succeeding focusing lens in the stack design, with the results being output to a designer.
    Type: Application
    Filed: March 20, 2008
    Publication date: September 11, 2008
    Inventors: Eric Gard, Vincent Riot, Keith Coffee, Bruce Woods, Herbert Tobias, Jim Birch, Todd Weisgraber
  • Patent number: 7361891
    Abstract: A pressure-flow reducer, and an aerosol focusing system incorporating such a pressure-flow reducer, for performing high-flow, atmosphere-pressure sampling while delivering a tightly focused particle beam in vacuum via an aerodynamic focusing lens stack. The pressure-flow reducer has an inlet nozzle for adjusting the sampling flow rate, a pressure-flow reduction region with a skimmer and pumping ports for reducing the pressure and flow to enable interfacing with low pressure, low flow aerosol focusing devices, and a relaxation chamber for slowing or stopping aerosol particles. In this manner, the pressure-flow reducer decouples pressure from flow, and enables aerosol sampling at atmospheric pressure and at rates greater than 1 liter per minute.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: April 22, 2008
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Eric Gard, Vincent Riot, Keith Coffee, Bruce Woods, Herbert Tobias, Jim Birch, Todd Weisgraber
  • Publication number: 20070023644
    Abstract: A pressure-flow reducer, and an aerosol focusing system incorporating such a pressure-flow reducer, for performing high-flow, atmosphere-pressure sampling while delivering a tightly focused particle beam in vacuum via an aerodynamic focusing lens stack. The pressure-flow reducer has an inlet nozzle for adjusting the sampling flow rate, a pressure-flow reduction region with a skimmer and pumping ports for reducing the pressure and flow to enable interfacing with low pressure, low flow aerosol focusing devices, and a relaxation chamber for slowing or stopping aerosol particles. In this manner, the pressure-flow reducer decouples pressure from flow, and enables aerosol sampling at atmospheric pressure and at rates greater than 1 liter per minute.
    Type: Application
    Filed: June 19, 2006
    Publication date: February 1, 2007
    Inventors: Eric Gard, Vincent Riot, Keith Coffee, Bruce Woods, Herbert Tobias, Jim Birch, Todd Weisgraber