Patents by Inventor Hendrik Leendert Rieffe

Hendrik Leendert Rieffe 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).

  • Publication number: 20100190648
    Abstract: Structured agrochemical concentrates comprise agrochemical actives dispersed in a structured oil system of an oil and structurant oligomer including urethane and/or urea linkages and residues of a dimer or trimer component. The concentrate formulations may contain other components such as surfactants without the structurant loosing its effect a problem with known structurants. The concentrates can be readily diluted to give sprayable agrochemical formulations.
    Type: Application
    Filed: May 18, 2007
    Publication date: July 29, 2010
    Applicant: Croda International PLC
    Inventors: Peter James Tollington, Frederico Irou Roschzttardtz, Remco Benjamin van Triet, Eric Appelman, Hendrik Leendert Rieffe
  • Patent number: 6008167
    Abstract: An ester based lubricant, particularly suitable for 4-stroke engines comprises at least one ester of a saturated, branched chain monohydric alcohol having at least 8 carbon atoms and a saturated branched chain aliphatic monocarboxylic acid having at least 10 carbon atoms. The esters have a kinematic viscosity of at most 35 cSt (40.degree. C.), a non-polarity index of at least 100, a Noack evaporation loss of at most 10% and a pour point below -30.degree. C.
    Type: Grant
    Filed: July 16, 1997
    Date of Patent: December 28, 1999
    Assignee: Unilever Patent Holdings B.V.
    Inventors: Eric Appelman, Dirk Kenbeek, Hendrik Leendert Rieffe
  • Patent number: 5707945
    Abstract: A base fluid for hydraulic or metal working fluids comprises the esterification product having a hydroxyl number below 15 and an acid number below 10 of polymerized fatty acids and a monohydric alkoxylated alcohol, selected from (a) straight or branched chain saturated monohydric C.sub.1 -C.sub.24 alcohols, alkoxylated with 2-25 moles of C.sub.2 -C.sub.5 alkylene oxide and (b) alkoxy poly(alkylene) glycol etherified with C.sub.1 -C.sub.4 aliphatic monohydric alcohol and which is alkoxylated with 2-25 moles of C.sub.2 -C.sub.5 alkylene oxide, optionally the alcohol component also comprises (c) a straight or branched chain C.sub.1 -C.sub.24 aliphatic monohydric alcohol. The acid number of the crude ester is preferably reduced by reacting it with a glycidyl ester of a C.sub.5 -C.sub.22 aliphatic monocarboxylic acid, preferably a C.sub.6 -C.sub.12 branched chain, aliphatic monocarboxylic acid.
    Type: Grant
    Filed: March 5, 1996
    Date of Patent: January 13, 1998
    Assignee: Unichema Chemie B. V.
    Inventors: Nigel Andrew John Cooban, Hendrik Leendert Rieffe
  • Patent number: 5688750
    Abstract: A base fluid for metal working fluids comprises a stoichiometrically neutral salt of the partial esterification product having an acid number of 10-120, preferably 20-100 of polymerized fatty acids and a monohydric alkoxylated alcohol, selected from (a) straight or branched chain saturated monohydric C.sub.1 -C.sub.24 alcohols, alkoxylated with 2-25 moles of C.sub.2 -C.sub.5 alkylene oxide, (b) alkoxy poly(alkylene) glycol etherified with C.sub.1 -C.sub.4 aliphatic monohydric alcohol and which is alkoxylated with 2-25 moles of C.sub.2 -C.sub.5 alkylene oxide, (c) an aliphatic, straight or branched chain, saturated or unsaturated C.sub.1 -C.sub.24 monohydric alcohol, and mixtures thereof, which partial ester is converted into a stoichiometrically neutral salt by neutralizing it by ammonium hydroxide, or an alkali metal hydroxide or an alkyl amine or an alkanol amine. Also the novel stoichiometrically neutral alkali metal and alkanol amine salts of the partial esters have been claimed.
    Type: Grant
    Filed: December 1, 1995
    Date of Patent: November 18, 1997
    Assignee: Unichema Chemie B. V.
    Inventors: Nigel Andrew John Cooban, Hendrik Leendert Rieffe