Patents by Inventor Robert G. Mathews

Robert G. Mathews 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).

  • Patent number: 11912493
    Abstract: A dispenser cap includes a shell, a scraper coupled to the shell, and a fluid-delivery controller. The dispenser cap mounts on a spray can, and the fluid-delivery controller engages with a valve of the spray can to selectively dispense pressurized fluid from the spray can.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: February 27, 2024
    Assignee: PRESTONE PRODUCTS CORPORATION
    Inventors: Thomas G. Kalagher, Joseph K. Mathews, Robert Pivetz
  • Patent number: 6643831
    Abstract: A novel parasitic extraction system includes an interconnect primitive library that has a parameterized inductance function for at least one conducting layer of the integrated circuit. A parasitic extractor analyzes structures within a selected distance of a selected conductor within the integrated circuit and determines parasitic inductance values for the selected conductor using the parameterized inductance function of the interconnect primitive library. Using this parasitic extraction system, parasitic impedances, including inductance, may be extracted for an integrated circuit layout, thus allowing more accurate modeling and timing analysis of the integrated circuit layout to be obtained.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: November 4, 2003
    Assignee: Sequence Design, Inc.
    Inventors: Keh-Jeng Chang, Li-Fu Chang, Robert G. Mathews, Martin G. Walker
  • Publication number: 20020104063
    Abstract: A novel parasitic extraction system includes an interconnect primitive library that has a parameterized inductance function for at least one conducting layer of the integrated circuit. A parasitic extractor analyzes structures within a selected distance of a selected conductor within the integrated circuit and determines parasitic inductance values for the selected conductor using the parameterized inductance function of the interconnect primitive library. Using this parasitic extraction system, parasitic impedances, including inductance, may be extracted for an integrated circuit layout, thus allowing more accurate modeling and timing analysis of the integrated circuit layout to be obtained.
    Type: Application
    Filed: January 24, 2002
    Publication date: August 1, 2002
    Inventors: Keh-Jeng Chang, Li-Fu Chang, Robert G. Mathews, Martin G. Walker
  • Patent number: 6403389
    Abstract: A method measures a resistance in a test structure to determine the sheet resistivity of a test structure. In one embodiment, a family of test structures is provided to determine the effective sheet resistivity of a conductor as a function of its width. The method is applicable to conductors in manufacturing processes in which “slots” or “islands” are created in the conductor to prevent dishing during chemical-mechanical polishing.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: June 11, 2002
    Assignee: Sequence Design, Inc.
    Inventors: Keh-Jeng Chang, Robert G. Mathews, Shih-tsun A. Chou, Abhay Dubey
  • Patent number: 6381730
    Abstract: A novel parasitic extraction system includes an interconnect primitive library that has a parameterized inductance function for at least one conducting layer of the integrated circuit. A parasitic extractor analyzes structures within a selected distance of a selected conductor within the integrated circuit and determines parasitic inductance values for the selected conductor using the parameterized inductance function of the interconnect primitive library. Using this parasitic extraction system, parasitic impedances, including inductance, may be extracted for an integrated circuit layout, thus allowing more accurate modeling and timing analysis of the integrated circuit layout to be obtained.
    Type: Grant
    Filed: July 9, 1999
    Date of Patent: April 30, 2002
    Assignee: Sequence Design, Inc.
    Inventors: Keh-Jeng Chang, Li-Fu Chang, Robert G. Mathews, Martin G. Walker
  • Patent number: 6312963
    Abstract: A method provides estimations of physical interconnect process parameter values in a process for manufacturing integrated circuits. The method includes fabricating test structures each providing a value of a measurable quantity corresponding to a value within a range of values of the physical interconnect process parameters. In some embodiments, the measured value is used to derive the values of the physical interconnect process parameters, either by a numerical method using a field solver, or by a closed-form solution. The values of physical interconnect process parameters involving physical dimensions are also obtained by measuring photomicrographs obtained using a scanning electron microscope from cross sections of test structures. In some embodiments, a family of test structures corresponding to a range of conductor widths and a range of spacings between conductors are measured.
    Type: Grant
    Filed: February 4, 1999
    Date of Patent: November 6, 2001
    Assignee: Sequence Design, Inc.
    Inventors: Shih-Tsun Alexander Chou, Keh-Jeng Chang, Robert G. Mathews
  • Patent number: 6311312
    Abstract: A method models conductive regions of a semiconductor substrate in conjunction with conductors in the interconnect structures above the semiconductor substrate. Such a method allows highly accurate extraction of capacitance in planar (e.g., shallow trench isolation) and non-planar (e.g., thermal oxide isolation) semiconductor structures. This method is particularly applicable to modeling dummy diffusion regions prevalent in shallow trench isolation structures. An area-perimeter approach simplifies calculation of capacitance without using a 3-dimensional electric field solver. A method is also provided for extracting a capacitance associate with a contact, or a connecting conductor between two conductor layers.
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: October 30, 2001
    Assignee: Sequence Design, Inc.
    Inventors: Keh-Jeng Chang, Robert G. Mathews, Li-Fu Chang, Xu Yang
  • Patent number: 6291254
    Abstract: A method provides estimations of physical interconnect process parameter values in a process for manufacturing integrated circuits. The method includes fabricating test structures each providing a value of a measurable quantity corresponding to a value within a range of values of the physical interconnect process parameters. In some embodiments, the measured value is used to derive the values of the physical interconnect process parameters, either by a numerical method using a field solver, or by a closed-form solution. The values of physical interconnect process parameters involving physical dimensions are also obtained by measuring photomicrographs obtained using a scanning electron microscope from cross sections of test structures. In some embodiments, a family of test structures corresponding to a range of conductor widths and a range of spacings between conductors are measured.
    Type: Grant
    Filed: February 4, 1999
    Date of Patent: September 18, 2001
    Assignee: Sequence Design, Inc.
    Inventors: Shih-tsun Alexander Chou, Keh-Jeng Chang, Robert G. Mathews
  • Patent number: 6057171
    Abstract: A method provides estimations of physical interconnect process parameter values in a process for manufacturing integrated circuits. The method includes fabricating test structures each providing a value of a measurable quantity corresponding to a value within a range of values of the physical interconnect process parameters. In some embodiments, the measured value is used to derive the values of the physical interconnect process parameters, either by a numerical method using a field solver, or by a closed-form solution. The values of physical interconnect process parameters involving physical dimensions are also obtained by measuring photomicrographs obtained using a scanning electron microscope from cross sections of test structures. In some embodiments, a family of test structures corresponding to a range of conductor widths and a range of spacings between conductors are measured.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: May 2, 2000
    Assignee: Frequency Technology, Inc.
    Inventors: Shih-tsun Alexander Chou, Keh-Jeng Chang, Robert G. Mathews