Patents by Inventor Rick Chao

Rick Chao 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).

  • Catalytic thermal debind furnaces with feedback control
    Patent number: 11988381
    Abstract: Apparatus and methods for debinding articles. The apparatus and methods may transform binder from furnace exhaust before the exhaust is discharged to the atmosphere. The apparatus may include a furnace retort and a reactor. The furnace retort may be configured to: exclude ambient air; and receive a carrier gas. The reactor may be configured to: receive from the retort (a) the carrier gas and (b) material removed in the retort from the article; and combust, at a temperature no greater than 750° C., the material. The material may be decomposed binder. The material may be hydrocarbon from binder that is pyrolyzed in the retort. The carrier gas may include gas that is nonflammable gas.
    Type: Grant
    Filed: June 10, 2020
    Date of Patent: May 21, 2024
    Assignee: Markforged, Inc.
    Inventors: Michelle Chao, Keith Durand, Rick Bryan Woodruff, Benjamin Hodsdon Gallup
  • Isolation, extraction and evaluation of transient distortions from a composite signal
    Patent number: 9668074
    Abstract: A method for processing a time-domain signal with transient oscillations includes: performing, by one or more computer systems, a time-frequency representation transform on the time-domain signal to obtain a plurality of coefficients for, with a coefficient corresponding to a presence of an impulse response of a filter used by the time-frequency representation transform; selecting one or more of the coefficients, with the selected one or more of the coefficients having attributes that are more indicative of the transient oscillations; and reconstructing, based on performing an inverse transform on the selected one or more coefficients, a portion of the time-domain signal that represents the transient oscillations.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: May 30, 2017
    Assignee: LitePoint Corporation
    Inventors: Todd Drullinger, Michael Smedegaard, Rick Chao, Soren Louis Pedersen
  • Isolation, Extraction and Evaluation of Transient Distortions from a Composite Signal
    Publication number: 20160037275
    Abstract: A method for processing a time-domain signal with transient oscillations includes: performing, by one or more computer systems, a time-frequency representation transform on the time-domain signal to obtain a plurality of coefficients for, with a coefficient corresponding to a presence of an impulse response of a filter used by the time-frequency representation transform; selecting one or more of the coefficients, with the selected one or more of the coefficients having attributes that are more indicative of the transient oscillations; and reconstructing, based on performing an inverse transform on the selected one or more coefficients, a portion of the time-domain signal that represents the transient oscillations.
    Type: Application
    Filed: August 1, 2014
    Publication date: February 4, 2016
    Inventors: Todd Drullinger, Michael Smedegaard, Rick Chao, Soren Louis Pedersen