Patents by Inventor John A. Walker, II

John A. Walker, II 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).

  • Phosphopeptide enrichment of compositions by fractionation on ceramic hydroxyapatite
    Patent number: 8907059
    Abstract: Phosphorylated peptides are extracted from digests of biological liquids and other peptide mixtures by fractionation on ceramic hydroxyapatite. The ceramic hydroxyapatite is readily usable in a centrifuge, allowing for rapid fractionations of a large number of small volume samples, and accordingly high throughput.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: December 9, 2014
    Assignee: Bio-Rad Laboratories, Inc.
    Inventors: Ning Liu, Katrina Academia, Aran Paulus, Tim Wehr, John A. Walker, II, Steve Freeby
  • SAMPLE PRESENTATION DEVICE
    Publication number: 20110070659
    Abstract: The present invention relates to sample presentation devices useful in performing analytical measurements. These devices have been configured to enable various aspects of liquid handling such as: retention, storage, transport, concentration, positioning, and transfer. Additionally, these devices can enhance the detection and characterization of analytes. The sample presentation devices of the present invention are comprised of one or more substrates having a plurality of zones of differing wettability. Methods of analyzing samples using the sample presentation device of the invention, as well as methods of making the sample presentation devices are disclosed.
    Type: Application
    Filed: May 24, 2010
    Publication date: March 24, 2011
    Applicant: Qiagen Sciences, Inc.
    Inventors: Christopher M. Belisle, John A. Walker, II, Sarah M. Ngola, Douglas P. Greiner, Mark J. Levy, Xiaoxia Zhao, Irene Y. Chen, Mark L. Stolowitz, Donald P. Paquin
  • PHOSPHOPEPTIDE ENRICHMENT OF COMPOSITIONS BY FRACTIONATION ON CERAMIC HYDROXYAPATITE
    Publication number: 20100125128
    Abstract: Phosphorylated peptides are extracted from digests of biological liquids and other peptide mixtures by fractionation on ceramic hydroxyapatite. The ceramic hydroxyapatite is readily usable in a centrifuge, allowing for rapid fractionations of a large number of small volume samples, and accordingly high throughput.
    Type: Application
    Filed: November 9, 2009
    Publication date: May 20, 2010
    Applicant: BIO-RAD LABORATORIES, INC.
    Inventors: Ning Liu, Katrina Academia, Aran Paulus, Tim Wehr, John A. Walker, II, Steve Freeby