Patents by Inventor Stephen L. Buchwalter

Stephen L. Buchwalter 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: 6924171
    Abstract: Methods for fabricating microelectronic interconnection structures as well as the structures formed by the methods are disclosed which improve the manufacturing throughput for assembling flip chip semiconductor devices. The use of a bilayer of polymeric materials applied on the wafer prior to dicing eliminates the need for dispensing and curing underfill for each semiconductor at the package level, thereby improving manufacturing throughput and reducing cost.
    Type: Grant
    Filed: February 13, 2001
    Date of Patent: August 2, 2005
    Assignee: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, David Danovitch, Fuad Elias Doany, Claudius Feger, Peter A. Gruber, Revathi Iyengar, Nancy C. LaBianca
  • Patent number: 6890599
    Abstract: New etch barriers of indium-tin-oxide in the manufacturing process of thin film transistor-liquid crystal display are self-assembled monolayers, such as n-alkylsilanes. A typical process of applying a self-assembled monolayer is to ink a hydrolyzed n-octadecyltrimethoxysilane solution on to a stamp and then to transfer the solution onto ITO. The surface of the stamp may be polar enough to be wet with polar self-assembled monolayer solutions of an akylsilane. A non-polar stamp surface may be treated with oxygen plasma to obtain a wettable polar surface.
    Type: Grant
    Filed: June 13, 2003
    Date of Patent: May 10, 2005
    Assignee: Intellectual Business Machines Corporation
    Inventors: Stephen L. Buchwalter, Gareth Geoffrey Hougham, Kang-Wook Lee, John J. Ritsko, Mary Elizabeth Rothwell, Peter M. Fryer
  • Patent number: 6879098
    Abstract: A method for fabricating a display device patterns a conductive layer on a display substrate and forms pixel electrodes on the display substrate. A plate is employed for carrying separately fabricated active devices to the display substrate. The separately fabricated devices are connected to the conductive layers and the pixel electrode.
    Type: Grant
    Filed: January 13, 2004
    Date of Patent: April 12, 2005
    Assignee: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, Evan G. Colgan, Sung Kwon Kang, Robert L. Wisnieff
  • Publication number: 20040140763
    Abstract: A method for fabricating a display device patterns a conductive layer on a display substrate and forms pixel electrodes on the display substrate. A plate is employed for carrying separately fabricated active devices to the display substrate. The separately fabricated devices are connected to the conductive layers and the pixel electrode.
    Type: Application
    Filed: January 13, 2004
    Publication date: July 22, 2004
    Inventors: Stephen L. Buchwalter, Evan G. Colgan, Sung Kwon Kang, Robert L. Wisnieff
  • Publication number: 20040041280
    Abstract: Reworkable thermally conductive adhesive composition comprising a cured reaction product from a diepoxide wherein the epoxy groups are connected through an acyclic acetal moiety, a cyclic anhydride and a thermally conductive filler are provided and used to bond semiconductive devices to a chip carrier or heat spreader.
    Type: Application
    Filed: September 5, 2003
    Publication date: March 4, 2004
    Applicant: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, Michael Anthony Gaynes, Nancy C. LaBianca, Stefano Sergio Oggioni, Son K. Tran
  • Patent number: 6698077
    Abstract: A method for fabricating a display device patterns a conductive layer on a display substrate and forms pixel electrodes on the display substrate. A plate is employed for carrying separately fabricated active devices to the display substrate. The separately fabricated devices are connected to the conductive layers and the pixel electrode.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: March 2, 2004
    Assignee: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, Evan G. Colgan, Sung Kwon Kang, Robert L. Wisnieff
  • Publication number: 20030211341
    Abstract: New etch barriers of indium-tin-oxide in the manufacturing process of thin film transistor-liquid crystal display are self-assembled monolayers, such as n-alkylsilanes. A typical process of applying a self-assembled monolayer is to ink a hydrolyzed n-octadecyltrimethoxysilane solution on to a stamp and then to transfer the solution onto ITO. The surface of the stamp may be polar enough to be wet with polar self-assembled monolayer solutions of an akylsilane. A non-polar stamp surface may be treated with oxygen plasma to obtain a wettable polar surface.
    Type: Application
    Filed: June 13, 2003
    Publication date: November 13, 2003
    Inventors: Stephen L. Buchwalter, Gareth Geoffrey Hougham, Kang-Wook Lee, John J. Ritsko, Mary Elizabeth Rothwell, Peter M. Fryer
  • Patent number: 6632536
    Abstract: New etch barriers of indium-tin-oxide in the manufacturing process of thin film transistor-liquid crystal display are self-assembled monolayers, such as n-alkylsilanes. A typical process of applying a self-assembled monolayer is to ink a hydrolyzed n-octadecyltrimethoxysilane solution on to a stamp and then to transfer the solution onto ITO. The surface of the stamp may be polar enough to be wet with polar self-assembled monolayer solutions of an akylsilane. A non-polar stamp surface may be treated with oxygen plasma to obtain a wettable polar surface.
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: October 14, 2003
    Assignee: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, Gareth Geoffrey Hougham, Kang-Wook Lee, John J. Ritsko, Mary Elizabeth Rothwell, Peter M. Fryer
  • Publication number: 20020109228
    Abstract: Methods for fabricating microelectronic interconnection structures as well as the structures formed by the methods are disclosed which improve the manufacturing throughput for assembling flip chip semiconductor devices. The use of a bilayer of polymeric materials applied on the wafer prior to dicing eliminates the need for dispensing and curing underfill for each semiconductor at the package level, thereby improving manufacturing throughput and reducing cost.
    Type: Application
    Filed: February 13, 2001
    Publication date: August 15, 2002
    Inventors: Stephen L. Buchwalter, David Danovitch, Fuad Elias Doany, Claudius Feger, Peter A. Gruber, Revathi Iyengar, Nancy C. LaBianca
  • Publication number: 20020084252
    Abstract: New etch barriers of indium-tin-oxide in the manufacturing process of thin film transistor-liquid crystal display are self-assembled monolayers, such as n-alkylsilanes. A typical process of applying a self-assembled monolayer is to ink a hydrolyzed n-octadecyltrimethoxysilane solution on to a stamp and then to transfer the solution onto ITO. The surface of the stamp may be polar enough to be wet with polar self-assembled monolayer solutions of an akylsilane. A non-polar stamp surface may be treated with oxygen plasma to obtain a wettable polar surface.
    Type: Application
    Filed: December 28, 2000
    Publication date: July 4, 2002
    Inventors: Stephen L. Buchwalter, Gareth Geoffrey Hougham, Kang-Wook Lee, John J. Ritsko, Mary Elizabeth Rothwell, Peter M. Fryer
  • Publication number: 20020078559
    Abstract: A method for fabricating a display device patterns a conductive layer on a display substrate and forms pixel electrodes on the display substrate. A plate is employed for carrying separately fabricated active devices to the display substrate. The separately fabricated devices are connected to the conductive layers and the pixel electrode.
    Type: Application
    Filed: December 27, 2000
    Publication date: June 27, 2002
    Applicant: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, Evan G. Colgan, Sung Kwon Kang, Robert L. Wisnieff
  • Patent number: 6177975
    Abstract: A system for aligning two plates, in accordance with the present invention, includes a first plate having a lithographically patterned structure formed on a first surface. A second plate also has a lithographically patterned structure formed on a second surface, the first and second surfaces being disposed to face each other. The patterned structures of the plates have corresponding and opposing edges to provide an interference fit between the patterned structures of the first and second plates wherein self-alignment between the first and second plates is realized by engaging the corresponding and opposing edges in the interference fit.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: January 23, 2001
    Assignee: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, David A. Lewis, Shui-Chih Alan Lien, Sampath Purushothaman, John J. Ritsko
  • Patent number: 6104466
    Abstract: A system for aligning two plates, in accordance with the present invention, includes a first plate having a lithographically patterned structure formed on a first surface. A second plate also has a lithographically patterned structure formed on a second surface, the first and second surfaces being disposed to face each other. The patterned structures of the plates have corresponding and opposing edges to provide an interference fit between the patterned structures of the first and second plates wherein self-alignment between the first and second plates is realized by engaging the corresponding and opposing edges in the interference fit.
    Type: Grant
    Filed: January 7, 1999
    Date of Patent: August 15, 2000
    Assignee: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, David A. Lewis, Shui-Chih Alan Lien, Sampath Purushothaman, John J. Ritsko
  • Patent number: 5759285
    Abstract: A composition for cleaning solder to remove flux, flux reaction products, residues, including residues from manufacturing operations such as plating and photoresist residues and other contaminants, without any significant dissolution of the solder especially solder used in fabricating electronic components such as C4 area array flip chip connectors, is provided. The composition comprises a non-aromatic sulfonic acid and a substituted alcohol with a preferred composition comprising 3 weight % methanesulfonic acid and 97 weight % trifluoroethanol. A method for cleaning solder and solder containing components made using the cleaning method and composition of the invention are also disclosed.
    Type: Grant
    Filed: August 20, 1996
    Date of Patent: June 2, 1998
    Assignee: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, Anson J. Call
  • Patent number: 5563273
    Abstract: An electrochemical color change cell incorporating as a color changing agent intramolecular charge transfer salt or an intermolecular charge transfer salt. The intermolecular charge transfer salts and the intramolecular charge transfer salts have a plurality of oxidation states and a wide variation in color change. The intermolecular and intramolecular charge transfer salts preferably contain a violene moiety and a moiety having a carbonyl group conjugated to an aromatic moiety. The intramolecular charge transfer salts have a stable covalent radical-anion/radical-cation configuration. The intermolecular charge transfer salts have a stable ionic radical-anion/radical-cation configuration.
    Type: Grant
    Filed: February 9, 1994
    Date of Patent: October 8, 1996
    Assignee: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, Martin J. Goldberg, Revathi Iyengar, Terrence R. O'Toole, Alfred Viehbeck
  • Patent number: 5560934
    Abstract: A cleavable epoxy resin composition suitable for encapsulating electronic chips comprising the cured reaction product of a diepoxide containing a cyclic anhydride curing agent and an amine promoter.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 1, 1996
    Assignee: International Business Machines Corporation
    Inventors: Ali Afzali-Ardakani, Stephen L. Buchwalter, Jeffrey D. Gelorme, Laura L. Kosbar, Bert H. Newman, Frank L. Pompeo
  • Patent number: 5512613
    Abstract: A cleavable epoxy resin composition suitable for encapsulating electronic chips comprising the cured reaction product of a diepoxide containing a cyclic anhydride curing agent and an amine promoter.
    Type: Grant
    Filed: March 18, 1994
    Date of Patent: April 30, 1996
    Assignee: International Business Machines Corporation
    Inventors: Ali Afzali-Ardakani, Stephen L. Buchwalter, Jeffrey D. Gelorme, Laura L. Kosbar, Bert H. Newman, Frank L. Pompeo
  • Patent number: 5462628
    Abstract: Certain organic polymeric materials are capable of reversibly accepting or donating electrons from a reducing entity. The redox sites in the polymer accept electrons and, as a result, a change in the properties of the polymer occurs. This change is useful in modifying or etching the polymeric material. The material can be modified by incorporation of metallic seeds into the material at a controlled depth. The seeds are incorporated by interaction of cations of the metals with the redox sites in the polymer, which cause the reduction of the cations to form the neutral metallic seeds. Subsequent exposure of the polymeric material containing the seeds to an electroless bath causes further deposition of metal having the desirable characteristic of good adhesion to the polymeric material. Etching of the polymeric material can be carried out as a result of an increase in solubility of the polymer in aprotic solvents when its redox sites have accepted electrons.
    Type: Grant
    Filed: April 25, 1994
    Date of Patent: October 31, 1995
    Assignee: International Business Machines Corporation
    Inventors: Alfred Viehbeck, Martin Goldberg, Stephen L. Tisdale, Stephen L. Buchwalter, Kurt R. Grebe, Caroline A. Kovac, Linda C. Matthew
  • Patent number: 5357005
    Abstract: Method for treating surface of dielectric polymer with water vapor plasma to form reactive sites and grafting a reactive polymer thereto to tailor the properties of the dielectric polymer surface.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: October 18, 1994
    Assignee: International Business Machines Corporation
    Inventors: Stephen L. Buchwalter, Charles R. Davis, Ronald D. Goldblatt, Richard R. Thomas
  • Patent number: 5340451
    Abstract: A process is disclosed for producing a metal-organic polymer combination by contacting the polymer with a plasma followed by an aqueous solution of a metal salt. In one embodiment a water or nitrous oxide plasma is used to treat a polyimide or a fluorinated polymer. The polymer is combined with a metal cation, the metal being a catalyst for a conventional electroless coating after which it is contacted with an electroless metal plating bath for the formation of electrical circuits and especially for plating high aspect ratio vias in microcircuits. Unlike the conventional electroless process, the cationic catalytic metal is not reduced to a zero valent metal catalyst prior to the application of the electroless metal coating solution.The process also improves the wettability of the polymer, especially the fluorinated polymer and is especially useful in improving the wettability of high aspect ratio vias.
    Type: Grant
    Filed: May 13, 1993
    Date of Patent: August 23, 1994
    Assignee: International Business Machines Corporation
    Inventors: Leena P. Buchwalter, Stephen L. Buchwalter, Charles R. Davis, Ronald D. Goldblatt, John E. Heidenreich, III, Sharon L. Nunes, Jae M. Park, Richard R. Thomas, Domenico Tortorella, Luis M. Ferreiro, deceased