Patents by Inventor John W. Keller

John W. Keller 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).

  • Ligation clip remover
    Patent number: 5707377
    Abstract: A ligation clip remover removes closed ligation clips from a ligated vessel. The remover includes a handle assembly having a squeezable trigger and a slender barrel assembly connected to the handle assembly. A clip separating mechanism is connected to a distal end of the barrel assembly, and a shaft is slidably disposed in the barrel assembly for operating the clip separating mechanism when the trigger is squeezed.
    Type: Grant
    Filed: November 29, 1994
    Date of Patent: January 13, 1998
    Assignee: American Cyanamid Company
    Inventors: John W. Keller, Daniel Helme
  • Repressor protein and operon for regulating expression of polypeptides and its use in the preparation of 2,2-dialkyglycine decarboxylase of Pseudomonas cepacia
    Patent number: 5356796
    Abstract: A nucleotide sequence coding for a repressor protein for regulating gene expression that comprises about a 687 bp nucleotide region beginning about 81 bases upstream from the 2,2-dialkylglycine decarboxylase structural gene shown in FIG. 3. The repressor protein comprises about 229 amino acids. The nucleotide sequence is useful for regulating gene expression in recombinant expression vectors. The vectors and E. coli cells transformed with the vectors are useful for preparing Pseudomonas cepacia 2,2-dialkylglycine decarboxylase.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: October 18, 1994
    Assignee: The University of Alaska
    Inventor: John W. Keller
  • Prepressor protein gene for regulating expression of polypeptides and its use in the preparation of 2,2-dialkylglycine decarboxylase of Pseudomonas cepacia
    Patent number: 5210025
    Abstract: A nucleotide sequence coding for a repressor protein for regulating gene expression comprises about a 687 bp nucleotide region beginning about 81 bases upstream from the 2,2-dialkylglycine decarboxylase structural gene shown in FIG. 3. The repressor protein comprises about 229 amino acids. The nucleotide sequence is useful for regulating gene expression in recombinant expression vectors. The vectors and E. coli cells transformed with the vectors are useful for preparing Pseudomonas cepacia 2,2-dialkylglycine decarboxylase.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: May 11, 1993
    Assignee: University of Alaska
    Inventor: John W. Keller