Patents by Inventor Randal A. Hassler

Randal A. Hassler 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).

  • Genetic control of acetylation and pyruvylation of xanthan based polysaccharide polymers
    Publication number: 20020103370
    Abstract: Variant xanthan gums are provided which include a water-soluble polysaccharide polymer comprising repeating pentamer units having a D-glucose:D-mannose:D-glucuronic acid ratio of about 2:2:1, and a water-soluble polysaccharide polymer comprising repeating tetramer units having a D-glucose:D-mannose:D-glucuronic acid ratio of about 2:1:1. The D-glucose moieties are linked in a beta-[1,4] configuration. The inner D-mannose moieties are linked in an alpha-[1,3] configuration, generally to alternate glucose moieties. The D-glucuronic acid moieties are linked in a beta-[1,2] configuration to the inner mannose moieties. The outer mannose moieties are linked to the glucuronic acid moieties in a beta-[1,4] configuration. Processes for preparing the polysaccharide polymers are also provided.
    Type: Application
    Filed: November 13, 2001
    Publication date: August 1, 2002
    Inventors: Daniel H. Doherty, Donna M. Ferber, John D. Marrelli, Rebecca W. Vanderslice, Randal A. Hassler
  • Genetic control of acetylation and pyruvylation of xanthan based polysaccharide polymers
    Patent number: 6316614
    Abstract: Variant xanthan gums are provided which include a water-soluble polysaccharide polymer comprising repeating pentamer units having a D-glucose:D-mannose:D-glucuronic acid ratio of about 2:2:1, and a water-soluble polysaccharide polymer comprising repeating tetramer units having a D-glucose:D-mannose:D-glucuronic acid ratio of about 2:1:1. The D-glucose moieties are linked in a beta-[1,4] configuration. The inner D-mannose moieties are linked in an alpha-[1,3] configuration, generally to alternate glucose moieties. The D-glucuronic acid moieties are linked in a beta-[1,2] configuration to the inner mannose moieties. The outer mannose moieties are linked to the glucuronic acid moieties in a beta-[1,4] configuration. Processes for preparing the polysaccharide polymers are also provided.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 13, 2001
    Assignee: CP Kelco U.S., Inc.
    Inventors: Daniel H. Doherty, Donna M. Ferber, John D. Marrelli, Rebecca W. Vanderslice, Randal A. Hassler
  • Preparation of water-soluble non-acetylated polysaccharide polymer having repeating pentamer units with xanthomonas
    Patent number: 5948651
    Abstract: Water-soluble polysaccharide polymers are provided including a polymer composed of repeating pentamer units having a D-glucose:D-mannose:D-glucuronic acid ratio of about 2:2:1, and a polymer composed of repeating tetramer units having a D-glucose:D-mannose:D-glucuronic acid ratio of about 2:1:1. The D-glucose moieties are linked in a beta-?1,4! configuration. The inner D-mannose moieties are linked in an alpha-?1,3! configuration, generally to alternate glucose moieties. The D-glucuronic acid moieties are linked in a beta-?1,2! configuration to the inner mannose moieties. The outer mannose moieties are linked to the glucuronic acid moieties in a beta-?1,4! configuration. Also an isolated acetylase deficient mutant of Xanthomonas is used in a process to produce the polysaccharide.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: September 7, 1999
    Assignee: Monsanto Company
    Inventors: Daniel H. Doherty, Randal A. Hassler
  • Genetic control of acetylation and pyruvylation of xanthan based polysaccharide polymers
    Patent number: 5514791
    Abstract: Variant xanthan gums are provided which include a water-soluble polysaccharide polymer comprising repeating pentamer units having a D-glucose:D-mannose:D-glucuronic acid ratio of about 2:2:1, and a water-soluble polysaccharide polymer comprising repeating tetramer units having a D-glucose:D-mannose:D-glucuronic acid ratio of about 2:1:1. The D-glucose moieties are linked in a beta- 1,4! configuration. The inner D-mannose moieties are linked in an alpha- 1,3! configuration, generally to alternate glucose moieties. The D-glucuronic acid moieties are linked in a beta- 1,2! configuration to the inner mannose moieties. The outer mannose moieties are linked to the glucuronic acid moieties in a beta- 1,4! configuration. Processes for preparing the polysaccharide polymers are also provided.
    Type: Grant
    Filed: April 25, 1994
    Date of Patent: May 7, 1996
    Assignee: Getty Scientific Development Company
    Inventors: Daniel H. Doherty, Donna M. Ferber, John D. Marrelli, Rebecca W. Vanderslice, Randal A. Hassler
  • Carotenoid producing culture using Nespongiococcum excentricum
    Patent number: 5437997
    Abstract: A culture for the production of xanthophylls comprising Nospongiococcum excentricum ATCC 40335 and mutants thereof. The culture having a dry cell weight xanthophyll content of at least about 0.65% and being capable of growing to a cell density of greater than about 40 grams per liter. The culture also comprising: carbon, phosphate, sulfate, iron, magnesium, and nitrogen.
    Type: Grant
    Filed: February 5, 1990
    Date of Patent: August 1, 1995
    Assignee: Universal Foods Corporation
    Inventors: Hans H. Liao, Richard D. Medwid, Donald L. Heefner, Kathleen S. Sniff, Randal A. Hassler, Michael J. Yarus