Patents by Inventor David L. Walker

David L. Walker 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: 6468135
    Abstract: The present invention is a method and apparatus for CMP processing that reduces scratching of the insulating film and conductor lines of a wafer. More specifically, the method and apparatus introduce an aqueous solution to the polishing pad and wafer during various intervals of the polishing procedure.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: October 22, 2002
    Assignee: International Business Machines Corporation
    Inventors: Jose L. Cruz, Cuc K. Huynh, David L. Walker
  • Publication number: 20020005212
    Abstract: An apparatus for and method of detecting the presence of a brush used in a semiconductor wafer cleaner for post-CMP processing is described. Semiconductor wafers are loaded into the wet environment of the wafer cleaner, affixed to a rotatable fixture and rotated at high speed. The rotatable fixture is effectuated by a servo motor linked to a servo controller and a torque monitor. A first torque on the rotating wafer is calculated prior to the start of the brush cleaning cycle. During the brush cleaning cycle, as the brush within the brush cleaner contacts the rotating wafer, the torque on the wafer increases and a second torque is calculated. If, during the brush cleaning cycle, the second torque calculation is substantially equal to the first torque calculation, the brush cleaner is not contacting the wafer and cleaning has not progressed. A tool user can be notified to reaffix the brush within the cleaner.
    Type: Application
    Filed: June 7, 2001
    Publication date: January 17, 2002
    Applicant: International Business Machines Corporation
    Inventors: Gary J. Beardsley, Timothy S. Bullard, Cuc Kim Huynh, Theodore G. Van Kessel, David L. Walker
  • Publication number: 20020001370
    Abstract: A voice portal platform for communicating content to a telephone user during a telephone call includes a manager for receiving and executing voice application logic of voice applications and for providing a telephone user session having a voice application for the telephone user during the telephone call. A telephony channel provides telephony event signals between the telephone user and the voice application indicative of telephony events. A speech channel provides speech event signals to the voice application and the telephone user in response to speech events from the telephone user and the voice application. A content server provides content event signals by accessing requested content from content sources. The manager maps the voice application logic of the voice application to the telephony channel, the speech channel, and the content server for execution of the voice application logic to generate the event signals during the telephone call.
    Type: Application
    Filed: June 5, 2001
    Publication date: January 3, 2002
    Inventors: David L. Walker, Mark G. Mackelprang, David V. Elsberry, Robert Selph
  • Publication number: 20010049602
    Abstract: A communication system for communicating information to a telephone user in response to a request for the information from the telephone user. The communication system includes a text data source having text documents. A voice application receives a request from the telephone user for information and then retrieves a text document related to the requested information from the text data source. A context detector determines the context of the text document. A text cleaner modifies the text document as a function of a context of the text document. A text-to-speech (TTS) converter converts the modified text document into speech. The TTS converter provides the speech to the telephone user via the voice application in order to satisfy the request for information from the telephone user.
    Type: Application
    Filed: May 10, 2001
    Publication date: December 6, 2001
    Inventors: David L. Walker, Mark G. Mackelprang, Andrew J. Sipe, Armand C. Sperduti
  • Publication number: 20010048736
    Abstract: A communication system for communicating content to a telephone user in response to a request for the content from the telephone user. The system includes a voice application operable for receiving a request from the telephone user for content and for generating a content request indicative of the content requested by the telephone user. A first consent provider is operable for periodically generating pushed content files and a second content provider is operable for generating on-demand content files. In response to receiving a content request from the voice application a content server is operable for providing content handlers having audio versions of pushed and on-demand content files related to the content requested by the telephone user from the content providers to the voice application. The voice application then plays the audio versions of the content files related to the content requested by the telephone user to the telephone user.
    Type: Application
    Filed: June 4, 2001
    Publication date: December 6, 2001
    Inventors: David L. Walker, Mark G. Mackelprang, Andrew J. Sipe
  • Publication number: 20010047260
    Abstract: A method and system for communicating information to a telephony user in response to a request for the information from the telephony user includes a text data source having text documents and a voice application operable with the text data source for retrieving a text document related to the requested information. A text-to-speech (TTS) manager divides the text document into text document segments. TTS engines convert the text document segments into speech segments. Each text document segment is converted into a speech segment by one TTS engine. A buffer reassembles the speech segments in the proper order and then delivers the speech segments to the user. The TTS manager divides the text document as a function of the rate at which speech segments are delivered to the user such that the speech segments are delivered from the TTS engines to the buffer and from the buffer to the user continuously.
    Type: Application
    Filed: May 16, 2001
    Publication date: November 29, 2001
    Inventors: David L. Walker, Mark G. Mackelprang, Andrew J. Sipe, David V. Elsberry
  • Patent number: 6299515
    Abstract: A polishing apparatus for polishing a substrate. The polishing apparatus has a slurry delivery system for delivering slurry to the apparatus; a porous polishing pad having an upper surface at which the substrate is polished; and a rotating platen upon which the porous pad lies. The rotating platen has a recess which has a first portion in communication with the delivery means for delivering slurry into the first portion. The recess further has a second portion extending under the polishing pad. Slurry is delivered from the first portion to the second portion and to the upper surface of the pad where it aids in the polishing of the substrate. Preferably, the first portion of the recess is situated such that the slurry delivered to the top surface returns to the first portion for removal or reuse due to the rotational force of the rotating platen.
    Type: Grant
    Filed: June 22, 2000
    Date of Patent: October 9, 2001
    Assignee: International Business Machines Corporation
    Inventors: Gary J. Beardsley, Cuc Kim Huynh, Steven J. Messier, David L. Walker
  • Patent number: 6135865
    Abstract: A polishing apparatus for polishing a substrate. The polishing apparatus has a slurry delivery system for delivering slurry to the apparatus; a porous polishing pad having an upper surface at which the substrate is polished; and a rotating platen upon which the porous pad lies. The rotating platen has a recess which has a first portion in communication with the delivery means for delivering slurry into the first portion. The recess further has a second portion extending under the polishing pad. Slurry is delivered from the first portion to the second portion and to the upper surface of the pad where it aids in the polishing of the substrate. Preferably, the first portion of the recess is situated such that the slurry delivered to the top surface returns to the first portion for removal or reuse due to the rotational force of the rotating platen.
    Type: Grant
    Filed: August 31, 1998
    Date of Patent: October 24, 2000
    Assignee: International Business Machines Corporation
    Inventors: Gary J. Beardsley, Cuc Kim Huynh, Steven J. Messier, David L. Walker
  • Patent number: 6012276
    Abstract: A harvester (10) includes a separator (22) to help separate unwanted plant material from a crop. Separator (22) includes a series of paddles (46) which are rotated in unison by a drive system (50). The crop, which will often comprise a vine or tree crop, and which will ideally comprise raisins (14), falls between rotating paddles (46). Plant materials, such as cane (60), is transported by the tops of the rotating paddles from over cane separator (22).
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: January 11, 2000
    Inventors: David L. Walker, Ray Austin, Jr.
  • Patent number: D436279
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: January 16, 2001
    Assignee: Zenith Products Corp.
    Inventor: David L. Walker
  • Patent number: D436780
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: January 30, 2001
    Assignee: Zenith Products Corp.
    Inventor: David L. Walker
  • Patent number: D444017
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: June 26, 2001
    Assignee: Zenith Products Corp.
    Inventor: David L. Walker
  • Patent number: D453652
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: February 19, 2002
    Assignee: Zenith Products Corp.
    Inventor: David L. Walker
  • Patent number: D459617
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: July 2, 2002
    Assignee: Zenith Products Corp.
    Inventors: Paul H. Winter, David L. Walker
  • Patent number: D459618
    Type: Grant
    Filed: June 28, 2001
    Date of Patent: July 2, 2002
    Assignee: Zenith Products Corp.
    Inventors: Paul H. Winter, David L. Walker
  • Patent number: D460290
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: July 16, 2002
    Assignee: Zenith Products Corp.
    Inventor: David L. Walker
  • Patent number: D472747
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: April 8, 2003
    Assignee: Zenith Products Corp.
    Inventor: David L. Walker
  • Patent number: D472748
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: April 8, 2003
    Assignee: Zenith Products Corp.
    Inventor: David L. Walker
  • Patent number: D472749
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: April 8, 2003
    Assignee: Zenith Products Corp.
    Inventor: David L. Walker
  • Patent number: D473085
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: April 15, 2003
    Assignee: Zenith Products Corp.
    Inventor: David L. Walker