Patents by Inventor Kathleen Lorraine Covert

Kathleen Lorraine Covert 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).

  • Method of producing fine-line circuit boards using chemical polishing
    Patent number: 6547974
    Abstract: A printed circuit board is produced by patterning a resist layer according to a circuit mask that defines desired circuit paths. The resist pattern layer is formed by removing the resist from the board in the desired circuit paths and a conductive material is plated onto the board in the resist voids defined by the circuit mask so that the height of the conductive material relative to the substrate equals or exceeds the height of the resist layer relative to the substrate. A low-reactive solution is applied over the conductive material and removes a surface portion of the conductive material. As the solution removes the conductive layer, it forms a film barrier and the solution composition changes, both of which substantially inhibits any further removal of the conductive material. Next, the film barrier is removed from the board allowing another film barrier to form stimulating the removal of further conductive material.
    Type: Grant
    Filed: June 27, 1995
    Date of Patent: April 15, 2003
    Assignee: International Business Machines Corporation
    Inventors: Stanley Michael Albrechta, Christina Marie Boyko, Kathleen Lorraine Covert, Natalie Barbara Feilchenfeld, Voya Rista Markovich, William Earl Wilson, Michael Wozniak
  • Selective etching of nickle/iron alloys
    Patent number: 5989443
    Abstract: The present invention provides a novel method of etching nickle/iron alloy which employs a novel etchant. The novel etchant, which etches nickle/iron alloy but not copper, comprises an aqueous solution of ferric ammonium sulfate, and an acid selected from the group consisting of: sulfuric acid; phosphoric acid; and mixtures thereof.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: November 23, 1999
    Assignee: International Business Machines Corporation
    Inventors: Kathleen Lorraine Covert, Lisa Jeanine Jimarez, Krystyna Waleria Semkow
  • Selective etching of nickle/iron alloys
    Patent number: 5723062
    Abstract: The present invention provides a novel method of etching nickle/iron alloy which employs a novel etchant. The novel etchant, which etches nickle/iron alloy but not copper, comprises an aqueous solution of ferric ammonium sulfate, and an acid selected from the group consisting of: sulfuric acid; phosphoric acid; and mixtures thereof.
    Type: Grant
    Filed: May 28, 1996
    Date of Patent: March 3, 1998
    Assignee: International Business Machines Corporation
    Inventors: Kathleen Lorraine Covert, Lisa Jeanine Jimarez, Krystyna Waleria Semkow