Patents by Inventor Sigrid M. R. Gelderland

Sigrid M. R. Gelderland 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).

  • Activated carbon air filters
    Patent number: 6413303
    Abstract: An activated carbon air filter for use in room air cleaners and the like has a corrugated paper structure formed of substantially non-porous paper, preferably Kraft paper, whose surface is coated with carbon by means for example of a dipping process in which the structure is immersed in an aqueous slurry containing carbon and a binder. Through use of a particular paper thickness and channel dimensions, a highly efficient, low volume, long lifetime air cleaning filter is obtained.
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: July 2, 2002
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Sigrid M. R. Gelderland, Johannes Marra
  • ACTIVATED CARBON AIR FILTERS
    Publication number: 20010052224
    Abstract: An activated carbon air filter for use in room air cleaners and the like comprises a corrugated paper structure formed of substantially non-porous paper, preferably Kraft paper, whose surface is coated with carbon by means for example of a dipping process in which the structure is immersed in an aqueous slurry containing carbon and a binder. Through use of a particular paper thickness and channel dimensions, a highly efficient, low volume, long lifetime air cleaning filter is obtained.
    Type: Application
    Filed: March 11, 1999
    Publication date: December 20, 2001
    Applicant: U.S. Philips Corporation
    Inventors: SIGRID M R GELDERLAND, JOHANNES MARRA