Patents by Inventor Douglas P. Logan

Douglas P. Logan 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).

  • Orthophosphate-containing desalination scale inhibitors
    Patent number: 4634532
    Abstract: The instant invention is directed to a process for the control of scale formation and deposition in thermal or reverse osmosis membrane desalination plants, comprising adding to the water 0.1 to 100 ppm of (a) a water soluble orthophosphate and (b) at least one compound selected from the group consisting of water soluble polycarboxylates, phosphonates, phosphates, sulfonates and polyamides.
    Type: Grant
    Filed: September 25, 1985
    Date of Patent: January 6, 1987
    Assignee: Calgon Corporation
    Inventors: Douglas P. Logan, Thomas E. Cornelius, III, Susan P. Rey
  • Residual fuel oil conditioners containing metal salts in aqueous solution
    Patent number: 4512774
    Abstract: Residual fuel oil conditioners comprising an aqueous solution of (a) from 2.0 to 20.0% by weight of at least one water soluble metal salt selected from the halides, sulfates, and nitrates of magnesium, manganese, zinc, copper, lead, iron, nickel, aluminum, calcium and barium; and (b) from 0.1 to 25.0% by weight of a surfactant, preferably a nonionic surfactant having an HLB of from 12 to 17.
    Type: Grant
    Filed: December 27, 1978
    Date of Patent: April 23, 1985
    Assignee: Calgon Corporation
    Inventors: John G. Myers, Douglas P. Logan, Jerry L. Walker