Patents by Inventor W. Douglas Obal

W. Douglas Obal 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).

  • Patent number: 8685493
    Abstract: The present invention relates to a vessel, in particular a pipe, especially an oil pipe, having a preformed film adhered onto the interior surface of the pipe, the interior surface of the preformed film reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by at least 40% as compared to the interior surface of said oil pipe without said preformed film being present. In a preferred embodiment, the preformed film is adhered to the interior surface of the pipe with a primer layer with an optional barrier layer between the primer layer and the preformed film.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: April 1, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Laurence Waino McKeen, Kimberly Dawn Farnsworth, W. Douglas Obal, Pidatala K. Mohan
  • Patent number: 8453740
    Abstract: Disclosed is a process for reducing the deposition of asphaltenes, paraffin wax, or inorganic scale in an oil well pipe by providing a system of pipes that convey any flowable medium, such as oil and gas. More particularly the system of pipes is provided with different coatings or linings for the interior and exterior surfaces of such pipes, depending on the environment in which the pipes are used. The pipes may be coated with different materials, which may be of different thicknesses, with various configurations of coatings or linings. Such coating may be on the interior and/or exterior of the pipes.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: June 4, 2013
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Pidatala K. Mohan, Steven A. Mestemacher, Kimberly Dawn Farnsworth, Laurence Waino McKeen, W. Douglas Obal
  • Publication number: 20120241086
    Abstract: The present invention relates to a vessel, in particular a pipe, especially an oil pipe, having a preformed film adhered onto the interior surface of the pipe, the interior surface of the preformed film reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by at least 40% as compared to the interior surface of said oil pipe without said preformed film being present. In a preferred embodiment, the preformed film is adhered to the interior surface of the pipe with a primer layer with an optional barrier layer between the primer layer and the preformed film.
    Type: Application
    Filed: June 1, 2012
    Publication date: September 27, 2012
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: LAURENCE WAINO MCKEEN, Kimberly Dawn Farnsworth, W. Douglas Obal, Pidatala K. Mohan
  • Patent number: 8211497
    Abstract: The present invention relates to a vessel, in particular a pipe, especially an oil pipe, having a preformed film adhered onto the interior surface of the pipe, the interior surface of the preformed film reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by at least 40% as compared to the interior surface of said oil pipe without said preformed film being present. In a preferred embodiment, the preformed film is adhered to the interior surface of the pipe with a primer layer with an optional barrier layer between the primer layer and the preformed film.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: July 3, 2012
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Laurence Waino McKeen, Kimberly Dawn Farnsworth, W. Douglas Obal, Pidatala K. Mohan
  • Publication number: 20110041924
    Abstract: The present invention relates to the process of a system of pipes that convey any flowable medium, such as chemicals, food and in particular, oil and gas, and more particularly to a system of pipes having different coatings or linings for the interior and exterior surfaces of such pipes, depending on the environment in which the pipes are used. The pipes may be coated with different materials, which may be of different thicknesses, with various configurations of coatings or linings. Such coating may be done on the interior and/or the exterior of the pipes.
    Type: Application
    Filed: November 4, 2010
    Publication date: February 24, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Pidatala K. Mohan, Steven A. Mestemacher, Kimberly Dawn Farnsworth, Laurence Waino McKeen, W. Douglas Obal
  • Patent number: 7870877
    Abstract: The present invention relates to a pipe, especially an oil pipe, having a lining comprising a fluoropolymer adhered to its interior surface and a lining formed on its exterior surface. The interior and/or exterior lining may comprise a primer layer comprising a fluoropolymer, and preferably a perfluoropolymer and an overcoat or a preformed film adhered to the primer layer. Either the overcoat or the preformed liner also comprises a fluoropolymer, and preferably a perfluoropolymer. The surface of the lining facing the flowable media, such as oil, may be a pure perfluoropolymer to provide a particularly good non-stick surface for the oil.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: January 18, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Laurence Waino McKeen, Pidatala K. Mohan, Steven A. Mestemacher, Kimberly Dawn Farnsworth, W. Douglas Obal
  • Publication number: 20100043905
    Abstract: The present invention relates to a vessel, in particular a pipe, especially an oil pipe, having a preformed film adhered onto the interior surface of the pipe, the interior surface of the preformed film reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by at least 40% as compared to the interior surface of said oil pipe without said preformed film being present. In a preferred embodiment, the preformed film is adhered to the interior surface of the pipe with a primer layer with an optional barrier layer between the primer layer and the preformed film.
    Type: Application
    Filed: October 27, 2009
    Publication date: February 25, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Laurence Waino McKeen, Kimberly Dawn Farnsworth, W. Douglas Obal, Pidatala K. Mohan
  • Publication number: 20100043885
    Abstract: The present invention relates to a vessel, in particular a pipe, especially an oil pipe, having a preformed film adhered onto the interior surface of the pipe, the interior surface of the preformed film reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by at least 40% as compared to the interior surface of said oil pipe without said preformed film being present. In a preferred embodiment, the preformed film is adhered to the interior surface of the pipe with a primer layer with an optional barrier layer between the primer layer and the preformed film.
    Type: Application
    Filed: October 27, 2009
    Publication date: February 25, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Laurence Waino McKeen, Kimberly Dawn Farnsworth, W. Douglas Obal, Pidatala K. Mohan
  • Publication number: 20090265913
    Abstract: The present invention relates to a pipe, especially an oil pipe, having a lining comprising a fluoropolymer adhered to its interior surface and a lining formed on its exterior surface. The interior and/or exterior lining may comprise a primer layer comprising a fluoropolymer, and preferably a perfluoropolymer and an overcoat or a preformed film adhered to the primer layer. Either the overcoat or the preformed liner also comprises a fluoropolymer, and preferably a perfluoropolymer. The surface of the lining facing the flowable media, such as oil, may be a pure perfluoropolymer to provide a particularly good non-stick surface for the oil.
    Type: Application
    Filed: May 26, 2009
    Publication date: October 29, 2009
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Laurence Waino McKeen, Pidatala K. Mohan, Steven A. Mestemacher, Kimberly Dawn Farnsworth, W. Douglas Obal
  • Patent number: 7588058
    Abstract: The present invention relates to a pipe, especially an oil pipe, having a lining comprising a fluoropolymer adhered to its interior surface and a lining formed on its exterior surface. The interior and/or exterior lining may comprise a primer layer comprising a fluoropolymer, and preferably a perfluoropolymer and an overcoat or a preformed film adhered to the primer layer. Either the overcoat or the preformed liner also comprises a fluoropolymer, and preferably a perfluoropolymer. The surface of the lining facing the flowable media, such as oil, may be a pure perfluoropolymer to provide a particularly good non-stick surface for the oil.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: September 15, 2009
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Laurence Waino McKeen, Pidatala K. Mohan, Steven A. Mestemacher, Kimberly Dawn Farnsworth, W. Douglas Obal
  • Publication number: 20020017516
    Abstract: The invention provides an electrically heated cooking device having an electrically heated surface for cooking or heating food and a disposable insert of metal foil substrate coated with a nonstick polymer resin. The insert is replaceably affixed to the electrically heated surface so that the nonstick polymer coating on the metal foil substrate is in intimate contact with food being cooked or heated. The invention further provides a method for cooking a meat patty using the cooking device to produce a product with aesthetic appeal and desirable taste in an economic system.
    Type: Application
    Filed: May 9, 2001
    Publication date: February 14, 2002
    Inventors: Laurence W. McKeen, W. Douglas Obal, Richard C. Albert