Patents by Inventor Pieter-Jan Wiersema

Pieter-Jan Wiersema 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).

  • Shoe and leather care product
    Patent number: 7229486
    Abstract: The invention provides a water-based low VOC shoe and leather care product having good product properties and characteristics, which can be formulated by making an appropriate and careful selection of ingredients and their amounts. A shoe and leather care product according to the invention has been found to give results in the treatment of leather (shoes) closely resembling the results found when using a conventional, high VOC shoe care product. Furthermore, such favourable results can be achieved while significantly reducing the amount of organic solvents in the product.
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: June 12, 2007
    Assignee: SaraLee/DE N.V.
    Inventors: Pieter-Jan Wiersema, Wilhelmus Franciscus Petrus Maria Boonman, Shengyu Jin
  • Shoe and leather care product
    Publication number: 20040242706
    Abstract: The invention provides a water-based low VOC shoe and leather care product having good product properties and characteristics, which can be formulated by making an appropriate and careful selection of ingredients and their amounts. A shoe and leather care product according to the invention has been found to give results in the treatment of leather (shoes) closely resembling the results found when using a conventional, high VOC shoe care product. Furthermore, such favourable results can be achieved while significantly reducing the amount of organic solvents in the product.
    Type: Application
    Filed: April 15, 2004
    Publication date: December 2, 2004
    Applicant: Sara Lee/DE N.V.
    Inventors: Pieter-Jan Wiersema, Wilhelmus Franciscus Petrus Maria Boonman, Shengyu Jin