Patents by Inventor Tjalling M. Plantenga

Tjalling M. Plantenga 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).

  • PVdF-based powder coatings
    Patent number: 5030394
    Abstract: A process for preparing pigmented PVdF-based powder coating products is disclosed, which comprises the steps of (i) mixing PVdF resin with a compatible thermoplastic resin, preferably PMMA in a weight ratio of about 80:20 to 40:60, with pigments, and with a small amount of flow promoter, (ii) pelletizing the mixture of (i), and (iii) cryogenically grinding the pellets and sieving the large particles. Also disclosed is a process for coating a substrate, comprising the steps of (a) applying the above prepared powder coating product on a substrate, and (b) subjecting to a heat treatment.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: July 9, 1991
    Assignee: Labofina, S.A.
    Inventors: Willem Sietses, Tjalling M. Plantenga, Jean-Paul Dekerk
  • Paper object printed with ink and coated with a protective layer
    Patent number: 4830902
    Abstract: Paper, and especially bank notes, printed with ink that contains micronized wax is coated with cellulose ester or ether. Thereby it becomes soil-repelling and its useful life-time increases considerably.
    Type: Grant
    Filed: August 19, 1987
    Date of Patent: May 16, 1989
    Assignee: Joh. Enschede En Zonen Grafische Inrichting B.V.
    Inventors: Tjalling M. Plantenga, Gerhardus J. Mulder
  • PVdF-based powder coatings
    Patent number: 4770939
    Abstract: A process for preparing pigmented PVdF-based powder coating products is disclosed, which comprises the steps of (i) mixing PVdF resin with a compatible thermoplastic resin, preferably PMMA in a weight ratio of about 80:20 to 40:60, with pigments, and with a small amount of flow promoter, (ii) pelletizing the mixture of (i), and (iii) cryogenically grinding the pellets and sieving the large particles. Also disclosed is a process for coating a substrate, comprising the steps of (a) applying the above prepared powder coating product on a substrate, and (b) subjecting to a heat treatment.
    Type: Grant
    Filed: August 27, 1987
    Date of Patent: September 13, 1988
    Assignee: Labofina, S.A.
    Inventors: Willem Sietses, Tjalling M. Plantenga, Jean-Paul Dekerk