Patents by Inventor Walter Dudovicz

Walter Dudovicz 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).

  • Polishing silicon wafers
    Patent number: 6971950
    Abstract: An endless belt for a belt type polishing machine comprises a support fabric and a polymer layer of relatively low hardness. The polymer layer is formed with drainage grooves. The support fabric may comprise a non woven or woven material, or a membrane with oriented reinforcing yarns. A further version comprises a spiral-link fabric supporting a woven or non woven layer carrying the polymer layer. The polymer layer may be a double layer, the upper of which is either harder or softer than the lower layer.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: December 6, 2005
    Assignee: Praxair Technology, Inc.
    Inventor: Walter Dudovicz
  • Polishing silicon wafers
    Patent number: 6736714
    Abstract: An endless belt for a belt type polishing machine comprises a support fabric and a polymer layer of relatively low hardness. The polymer layer is formed with drainage grooves. The support fabric may comprise a non woven or woven material, or a membrane with oriented reinforcing yarns. A further version comprises a spiral-link fabric supporting a woven or non woven layer carrying the polymer layer. The polymer layer may be a double layer, the upper of which is either harder or softer than the lower layer.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: May 18, 2004
    Assignee: Praxair S.T. Technology, Inc.
    Inventor: Walter Dudovicz
  • Polishing silicon wafers
    Publication number: 20040087262
    Abstract: An endless belt for a belt type polishing machine comprises a support fabric and a polymer layer of relatively low hardness. The polymer layer is formed with drainage grooves. The support fabric may comprise a non woven or woven material, or a membrane with oriented reinforcing yarns. A further version comprises a spiral-link fabric supporting a woven or non woven layer carrying the polymer layer. The polymer layer may be a double layer, the upper of which is either harder or softer than the lower layer.
    Type: Application
    Filed: October 22, 2003
    Publication date: May 6, 2004
    Inventor: Walter Dudovicz
  • Polishing silicon wafers
    Publication number: 20030087594
    Abstract: An endless belt for a belt type polishing machine comprises a support fabric and a polymer layer of relatively low hardness. The polymer layer is formed with drainage grooves. The support fabric may comprise a non woven or woven material, or a membrane with oriented reinforcing yarns. A further version comprises a spiral-link fabric supporting a woven or non woven layer carrying the polymer layer. The polymer layer may be a double layer, the upper of which is either harder or softer than the lower layer.
    Type: Application
    Filed: December 10, 2002
    Publication date: May 8, 2003
    Inventor: Walter Dudovicz
  • POLISHING SILICON WAFERS
    Publication number: 20010034197
    Abstract: An endless belt for a belt type polishing machine comprises a support fabric and a polymer layer of relatively low hardness. The polymer layer is formed with drainage grooves. The support fabric may comprise a non woven or woven material, or a membrane with oriented reinforcing yarns. A further version comprises a spiral-link fabric supporting a woven or non woven layer carrying the polymer layer. The polymer layer may be a double layer, the upper of which is either harder or softer than the lower layer.
    Type: Application
    Filed: September 30, 1997
    Publication date: October 25, 2001
    Applicant: DUDOVICZ
    Inventor: WALTER DUDOVICZ
  • Roller apparatus
    Patent number: 5571223
    Abstract: A roller apparatus (23) for use in the drying section of an apparatus for producing corrugated board comprises a tubular body operative to be received over a metal roller. The wall of the tubular body comprises an inner layer (24) of relatively hard polyurethane and an outer layer (25) of a deformable polyurethane. A spiral winding of yarn (26) is wrapped around the inner layer (24).
    Type: Grant
    Filed: June 22, 1993
    Date of Patent: November 5, 1996
    Assignee: Scapa Group PLC
    Inventor: Walter Dudovicz