Patents Assigned to P.R. Hoffman Machine Products, Inc.
  • Method of manufacturing wafer holder
    Patent number: 11759910
    Abstract: A method of manufacturing a wafer holder, the wafer holder having a frame having at least one cavity capable of receiving and supporting a wafer grown from an ingot to be polished in a polishing machine, the at least one cavity having a cross sectional footprint at least equal to a cross sectional footprint of the wafer, the wafer having a thickness to cross sectional area ratio of 0.001 per unit length or less, a polymer film pad being permanently affixed in the at least one cavity, including cutting a frame from a layer of a thermoset or thermoplastic material having a thickness tolerance and measuring a thickness of the frame at at least one location thereon. The method further includes forming a cavity in the frame having a predetermined depth, and permanently affixing a polymer film pad in the cavity.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: September 19, 2023
    Assignee: P. R. HOFFMAN MACHINE PRODUCTS, INC.
    Inventors: David Melville Hutton, Gary William Wimmersberger, Mara Lindsay Pagano
  • Polishing machine wafer holder
    Patent number: 10556317
    Abstract: A wafer holder is provided for use in a polishing machine. The wafer holder has a frame composed of a thermoset material and/or a thermoplastic material. The frame has at least one cavity for receiving and supporting a wafer to be polished in the polishing machine. A polymer film pad is permanently affixed in the at least one cavity.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: February 11, 2020
    Assignee: P.R. HOFFMAN MACHINE PRODUCTS INC.
    Inventors: David Melville Hutton, Gary William Wimmersberger, Mara Lindsay Pagano
  • RFID-containing carriers used for silicon wafer quality
    Patent number: 8388410
    Abstract: A carrier configured for use in a lapping machine includes a body having a first opening for carrying a work piece during operation of the lapping machine. A device is arranged and disposed in the body. The device is configured to retain information readable by a reading device for identifying the body.
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: March 5, 2013
    Assignee: P.R. Hoffman Machine Products, Inc.
    Inventor: John Wesley Albright, Jr.
  • RFID-CONTAINING CARRIERS USED FOR SILICON WAFER QUALITY
    Publication number: 20090114549
    Abstract: A carrier configured for use in a lapping machine includes a body having a first opening for carrying a work piece during operation of the lapping machine. A device is arranged and disposed in the body. The device is configured to retain information readable by a reading device for identifying the body.
    Type: Application
    Filed: November 5, 2007
    Publication date: May 7, 2009
    Applicant: P.R. HOFFMAN MACHINE PRODUCTS INC.
    Inventor: John Wesley Albright, JR.