Patents by Inventor Charles W. Blewett

Charles W. Blewett 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).

  • Process for the production of polybasic acid esters with recovery of boron trifluoride
    Patent number: 4973743
    Abstract: This invention provides a process for preparing an oligomer of at least one polyunsaturated aliphatic C.sub.12-22 monocarboxylic acid ester in the presence of boron trifluoride resulting in a high yield or predominantly trimeric product which, upon hydrolysis, affords a high yield of polybasic, predominantly trimeric, acids. This invention further provides such a process with excellent recovery of the boron trifluoride.
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: November 27, 1990
    Assignee: Henkel Corporation
    Inventors: Stephen W. Turner, Charles W. Blewett
  • Non-radioactive carbodiimide precursor to nucleic acid probes
    Patent number: 4895955
    Abstract: This invention relates to carbodiimide compounds of the formula:Z--L--W--N.dbd.C.dbd.N--R.sub.1wherein Z is a signalling moiety or a protecting group; L is a divalent linking group; W is an alkylene group having up to 24 carbon atoms which can be substituted or interrupted by a water solubility enhancing group or cleavable S--S group; and R.sub.1 is an alkyl group having up to 18 carbon atoms. These compounds are useful in the nonradioactive labelling of nucleic acid probes, and methods employing same.
    Type: Grant
    Filed: May 27, 1988
    Date of Patent: January 23, 1990
    Assignees: Lifecodes Corporation, Quantum Chemical Corporation, Trustees of Columbia University
    Inventors: John P. Ford, Charles W. Blewett, Michael D. Sublett, Bernard F. Erlanger, Alan F. Cook
  • Process for separating fatty materials from supported nickel catalysts
    Patent number: 4584140
    Abstract: A process for recovering fatty materials, such as fatty acids and lower alkyl esters thereof, from supported nickel catalyst compositions is provided. For the process, the supported nickel catalyst composition, which may also contain non-nickel containing clays/earths, is extracted with a supercritical fluid, preferably supercritical carbon dioxide, to separate the fatty material from the supported nickel catalyst composition.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: April 22, 1986
    Assignee: National Distillers and Chemical Corporation
    Inventors: Charles W. Blewett, Stephen W. Turner
  • Process for the metathesis of alkenyl esters
    Patent number: 4496758
    Abstract: An improved process for the metathesis of alkenyl esters utilizing substantially reduced catalyst levels is provided. For the process, an alkenyl ester of the formula ##STR1## where R is hydrogen or alkyl, R* is tertiary alkyl or an aromatic group, and n is an integer from 2 to 20 is reacted with a tungsten hexachloride/tetraalkyltin catalyst.
    Type: Grant
    Filed: October 13, 1983
    Date of Patent: January 29, 1985
    Assignee: National Distillers and Chemical Corporation
    Inventors: Charles W. Blewett, Michael D. Sublett
  • Process for converting .alpha.-olefin dimers to higher more useful oligomers
    Patent number: 4469912
    Abstract: A process is provided whereby the dimer fraction obtained from a boron trifluoride catalyzed oligomerization process is reacted with an .alpha.-olefin in the presence of a phosphoric acid-modified boron trifluoride catalyst to produce higher oligomeric products typically having viscosities (210.degree. F.) in the 4 to 8 centistoke range.
    Type: Grant
    Filed: August 15, 1983
    Date of Patent: September 4, 1984
    Assignee: National Distillers and Chemical Corporation
    Inventors: Charles W. Blewett, Stephen W. Turner
  • Decomposition of polycarbonates to form terminally unsaturated alcohols
    Patent number: 4447659
    Abstract: Process for the preparation of terminally unsaturated alcohols by the thermal decomposition of a polycarbonate in the presence of titanium containing catalyst.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: May 8, 1984
    Assignee: National Distillers and Chemical Corporation
    Inventor: Charles W. Blewett
  • Olefin metathesis catalysts and process utilizing same
    Patent number: 4078013
    Abstract: Improved homogeneous metathesis catalysts are obtained by the use of a nitrogenous modifying agent with a tungsten compound and organotin compound. These modified catalyst systems used for olefin metathesis give significantly increased conversions and excellent product selectivity.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: March 7, 1978
    Assignee: Emery Industries, Inc.
    Inventors: Charles W. Blewett, William R. Garrett, Jr.
  • Olefin metathesis catalysts and process utilizing same
    Patent number: 4078012
    Abstract: Improved homogeneous metathesis catalysts are obtained by the use of a trivalent phosphorus modifying agent with a cocatalyst comprised of tungsten hexachloride and an organotin compound. These modified catalyst systems give significantly increased conversions and excellent product selectivity when used for olefin metathesis.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: March 7, 1978
    Assignee: Emery Industries, Inc.
    Inventors: Charles W. Blewett, William R. Garrett, Jr.