Patents Assigned to Dotolo Research Ltd.
  • Heavy oil remover
    Patent number: 6369016
    Abstract: A heavy oil remover comprises a hydrocarbon solvent, dipropylene glycol mono n-butyl ether, a volatility stabilizer, a salt of an alkyl aromatic sulfonic acid, a branched alcohol ethoxylate, an ethoxylated alkyl mercaptan, and water.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: April 9, 2002
    Assignee: Dotolo Research Ltd.
    Inventor: Jack T. Vlasblom
  • Heavy oil remover
    Patent number: 6310263
    Abstract: A heavy oil remover comprises a hydrocarbon solvent, dipropylene glycol mono n-butyl ether, a salt of an alkyl aromatic sulfonic acid, a branched alcohol ethoxylate, an ethoxylated alkyl mercaptan, and water.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: October 30, 2001
    Assignee: Dotolo Research Ltd.
    Inventor: Jack T. Vlasblom
  • Heavy oil remover
    Patent number: 6235698
    Abstract: A heavy oil remover comprises a hydrocarbon solvent, dipropylene glycol mono n-butyl ether, a volatility stabilizer, a salt of an alkyl aromatic sulfonic acid, a branched alcohol ethoxylate, an ethoxylated alkyl mercaptan, and water.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: May 22, 2001
    Assignee: Dotolo Research Ltd.
    Inventor: Jack T. Vlasblom
  • Heavy oil remover
    Patent number: 6228830
    Abstract: A heavy oil remover comprises d-limonene, dipropylene glycol mono n-butyl ether, a salt of an alkyl aromatic sulfonic acid, a carboxylated anionic detergent, an ethoxylated tallow amine, a branched alcohol ethoxylate, an ethoxylated alkyl mercaptan, and water.
    Type: Grant
    Filed: June 27, 2000
    Date of Patent: May 8, 2001
    Assignee: Dotolo Research Ltd.
    Inventor: Jack T. Vlasblom
  • High wax content heavy oil remover
    Patent number: 6197734
    Abstract: A high wax content heavy oil remover comprises dipropylene glycol mono n-butyl ether, ethoxylated alkyl mercaptan, salt of an alkyl aromatic sulfonic acid, branched alcohol ethoxylate, d-limonene, and white oil.
    Type: Grant
    Filed: October 13, 1999
    Date of Patent: March 6, 2001
    Assignee: Dotolo Research Ltd.
    Inventor: Jack T. Vlasblom
  • Asphalt and heavy oil degreaser
    Patent number: 6093689
    Abstract: An asphalt and heavy oil degreaser comprises a cyclic hydrocarbon solvent, dipropylene glycol mono n-butyl ether, a salt of an alkyl aromatic sulfonic acid, a branched alcohol ethoxylate, and an ethoxylated alkyl mercaptan.
    Type: Grant
    Filed: September 20, 1999
    Date of Patent: July 25, 2000
    Assignee: Dotolo Research Ltd.
    Inventor: Jack T. Vlasblom
  • Asphalt and heavy oil degreaser
    Patent number: 6090769
    Abstract: An asphalt and heavy oil degreaser comprises a cyclic hydrocarbon solvent, dipropylene glycol mono n-butyl ether, a volatility stabilizer, a salt of an alkyl aromatic sulfonic acid, a branched alcohol ethoxylate, and an ethoxylated alkyl mercaptan.
    Type: Grant
    Filed: September 20, 1999
    Date of Patent: July 18, 2000
    Assignee: Dotolo Research Ltd.
    Inventor: Jack T. Vlasblom
  • Heavy oil remover
    Patent number: 5998352
    Abstract: A heavy oil remover comprises from about 0.1 to about 99 weight percent dipropylene glycol Mono N-butyl ether, from about 1 to about 99 percent of a mixture of methyl cocoate and methyl sunflowerate, from about 0.1 to about 75 weight percent napthenic petroleum distillate solvent, from about 0.1 to about 90 weight percent salt of an alkyl aromatic sulfonic acid, from about 0.05 to about 50 weight percent branched alcohol ethoxylate, from about 0.05 to about 50 weight percent ethoxylated alkyl mercaptan, and the balance, water.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: December 7, 1999
    Assignee: Dotolo Research Ltd.
    Inventor: Jack T. Vlasblom
  • Heavy oil remover
    Patent number: 5985816
    Abstract: A heavy oil remover comprises a terpene solvent, dipropylene glycol mono n-butyl ether, a volatility stabilizer, a salt of an alkyl aromatic sulfonic acid, a branched alcohol ethoxylate, an ethoxylated alkyl mercaptan, and water.
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: November 16, 1999
    Assignee: Dotolo Research Ltd.
    Inventor: Jack T. Vlasblom