Patents by Inventor Shirley A. Walker

Shirley A. 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: 5994118
    Abstract: A novel protein (Abi900, 183 amino acids) and its gene were isolated from a 11-kb natural plasmid (pSRQ900) of Lactococcus lactis. When pSRQ900 is introduced into dairy starter cultures, the Abi900 protein confers strong resistance to bacteriophage infection.
    Type: Grant
    Filed: November 28, 1997
    Date of Patent: November 30, 1999
    Assignee: Quest International B.V.
    Inventors: Sylvain Moineau, Eric Emond, Shirley A. Walker, Ebenezer R. Vedamuthu, Jeffrey K. Kondo
  • Patent number: 5972673
    Abstract: An isolated DNA of a Lactococcus lactisshowing a SEQ ID NO:1 encoding a restriction and two modification enzymes (R/M SEQ ID NO: 2, 3 and 4). The isolated DNA is used to transform sensitive dairy cultures, such as Lactococcus lactis and Streptococcus thermophilus, to provide phage resistance. Escherichia coli can be used to produce endonucleases.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: October 26, 1999
    Assignee: Quest International Flavors & Food Ingredients Company
    Inventors: Sylvain Moineau, Shirley A. Walker, Ebenezer R. Vedamuthu, Peter A. Vandenbergh
  • Patent number: 5925388
    Abstract: An isolated DNA of a Lactococcus lactis showing a SEQ ID NO:1 encoding a restriction and twp modification enzymes (R/M SEQ ID NO: 2, 3 and 4). The isolated DNA is used to transform sensitive dairy cultures, such as Lactococcus lactis and Streptococcus thermophilus, to provide phage resistance. Escherichia coli can be used to produce endonucleases.
    Type: Grant
    Filed: March 19, 1997
    Date of Patent: July 20, 1999
    Assignee: Quest International Flavors & Food Ingredients Company
    Inventors: Sylvain Moineau, Shirley A. Walker, Ebenezer R. Vedamuthu, Peter A. Vandenbergh
  • Patent number: 5877272
    Abstract: A bacteriocin produced by Lactococcus lactis NRRL-B-18535 is described. The bacteriocin is useful in foods and other materials and has a wide spectrum of activity against Gram-positive bacteria in a pH range between 2 and 8.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: March 2, 1999
    Assignee: Microlife Technics, Inc.
    Inventors: Peter A. Vandenbergh, Shirley A. Walker, Blair S. Kunka
  • Patent number: 5824523
    Abstract: An isolated DNA of a Lactococcus lactis showing a SEQ ID NO: 1 encoding a restriction and twp modification enzymes (R/M SEQ ID NO: 2, 3 and 4). The isolated DNA is used to transform sensitive dairy cultures, such as Lactococcus lactis and Streptococcus thermophilus, to provide phage resistance. Escherichia coli can be used to produce endonucleases.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: October 20, 1998
    Assignee: Quest International Flavors & Food Ingredients Company, Division of Indopco, Inc.
    Inventors: Sylvain Moineau, Shirley A. Walker, Ebenezer R. Vedamuthu, Peter A. Vandenbergh
  • Patent number: 5817362
    Abstract: A novel bacteriocin produced by Lactococcus lactis NRRL-B-18535 is described. The bacteriocin is useful in foods and other materials and has a wide spectrum of activity against Gram-positive bacteria in a pH range between 2 and 8.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: October 6, 1998
    Assignees: Quest International Flavors, Food Ingredients Company, Divison of Indopco, Inc.
    Inventors: Peter A. Vandenbergh, Shirley A. Walker, Blair S. Kunka
  • Patent number: 5817357
    Abstract: A bacteriocin produced by Lactococcus lactis NRRL-B-18535 is described. The bacteriocin is useful in foods and other materials and has a wide spectrum of activity against Gram-positive bacteria in a pH range between 2 and 8.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: October 6, 1998
    Assignee: Microlife Technics, Inc.
    Inventors: Peter A. Vandenbergh, Shirley A. Walker, Blair S. Kunka
  • Patent number: 5792625
    Abstract: Described herein is a bacterial cell containing a recombinant bacteriophage defense mechanism. The defense mechanism comprises a bacteriophage promoter (e.g., a phage .phi.31 promoter; a T7 promoter) operatively associated with a heterologous DNA encoding a product lethal to the bacterial cell. The bacterial cell is susceptible to infection by a bacteriophage, and the promoter is activated upon the infection of said bacterial cell by that bacteriophage. Bacteria useful in carrying out the invention include both gram negative and gram positive bacteria (e.g., Lactococcus lactis; Escherichia coli); the heterologous DNA may encode an enzyme that degrades nucleic acid (e.g., the products of the LlaI restriction cassette; barnase). Recombinant DNAs useful for making the foregoing cells, cultures prepared from such cells, and fermentation methods carried out with such cells are also disclosed.
    Type: Grant
    Filed: September 9, 1996
    Date of Patent: August 11, 1998
    Assignee: North Carolina State University
    Inventors: Todd R. Klaenhammer, Mark A. Conkling, Dan O'Sullivan, Gordana Djordjevic, Shirley A. Walker, Christopher G. Taylor
  • Patent number: 5702923
    Abstract: A method of making a bacteriocin produced by Lactococcus lactis NRRL-B-18535 is described. The bacteriocin is useful in foods and other materials and has a wide spectrum of activity against Gram-positive bacteria in a pH range between 2 and 8.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: December 30, 1997
    Assignee: Quest International Flavors & Food Ingredients Company, a division of Indopco, Inc.
    Inventors: Peter A. Vandenbergh, Shirley A. Walker, Blair S. Kunka