Patents by Inventor Klaas Keizer

Klaas Keizer 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).

  • Molecular sieve layers and processes for their manufacture
    Publication number: 20060252631
    Abstract: Layers comprising a molecular sieve layer on a porous or non-porous support, having uniform properties and allowing high flux are prepared from colloidal solutions of zeolite or other molecular sieve precursors (particle size less than 100 nm), by deposition, e.g., by spin or dip-coating, or by in situ crystallization.
    Type: Application
    Filed: April 13, 2006
    Publication date: November 9, 2006
    Inventors: Harry Deckman, Jannetje van den Berge, Allan Jacobson, James McHenry, Klaas Keizer, Zeger Alexander Vroon, Lothar Czarnetzki, Frank Lai, Antonie Bons, Anthonie Burggraaf, Johannes Verduijn, Edward Corcoran, Wilfred Mortier
  • Molecular sieve layers and processes for their manufacture
    Publication number: 20060189476
    Abstract: Layers comprising a molecular sieve layer on a porous or non-porous support, having uniform properties and allowing high flux are prepared from colloidal solutions of zeolite or other molecular sieve precursors (particle size less than 100 nm), by deposition, e.g., by spin or dip-coating, or by in situ crystallization.
    Type: Application
    Filed: April 13, 2006
    Publication date: August 24, 2006
    Inventors: Harry Deckman, Allan Jacobson, James McHenry, Klaas Keizer, Zeger Alexander Vroon, Lothar Czarnetzki, Frank Lai, Antonie Bons, Anthonie Burggraaf, Johannes Verduijn, Jannetje van den Berge, Edward Corcoran, Wilfred Mortier
  • Molecular sieve layers and processes for their manufacture
    Patent number: 7049259
    Abstract: Layers comprising a molecular sieve layer on a porous or non-porous support, having uniform properties and allowing high flux are prepared from colloidal solutions of zeolite or other molecular sieve precursors (particle size less than 100 nm), by deposition, e.g., by spin or dip-coating, or by in situ crystallization.
    Type: Grant
    Filed: April 25, 1994
    Date of Patent: May 23, 2006
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Harry William Deckman, Allan Joseph Jacobson, James Alexander McHenry, Klaas Keizer, Zeger Alexander Eduard Pieter Vroon, Lothar Ruediger Czarnetzki, Frank Wenyih Lai, Antonie Jan Bons, Anthonie Jan Burggraaf, Jannetje Maatje van den Berge, legal representative, Edward William Corcoran, Jr., Wilfred Jozef Mortier, Johannes Petrus Verduijn, deceased
  • Porous inorganic composite semipermeable membrane and a method of preparation
    Patent number: 5160617
    Abstract: A porous inorganic composite semipermeable membrane provided with a support and a separating layer which has pores with an average diameter less than 1 .mu.m and which comprises at least two refractory metal oxides, wherein:the separating layer is composed of grains of a first oxide phase and grains of at least one second oxide which is dispersed over and chemically bonded to the first oxide phase, so as to constitute at least a portion of the free surface of the grains of the first oxide phase and at least a portion of the grain boundaries between the grains of the first oxide phase;the first oxide phase and the second oxide are chosen so that the second oxide slows down diffusion both at the surface and at the grain boundary of the first oxide phase and has low solubility in the first oxide phase; andthe volume of the second oxide lies in the range of 0.1% to 25% of the volume of the first oxide phase.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: November 3, 1992
    Assignee: Aluminum Company of America
    Inventors: Marcel B. J. Huis In't Veld, Robert J. R. Uhlhorn, Yve-Sheng Lin, Klaas Keizer, Anthonie J. Burggraaf
  • Modified membrane
    Patent number: 5076926
    Abstract: A process is provided for modifying a ceramic ultrafiltration membrane system consisting of a sub-microporous top layer and a microporous inorganic carrier whereby said top layer after modification has reduced pore size and/or is made catalytically active.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: December 31, 1991
    Assignee: Shell Oil Company
    Inventors: Anthonie J. Burggraaf, Klaas Keizer, Robert J. R. Uhlhorn
  • Process for the preparation of a binary membrane top layer
    Patent number: 5030351
    Abstract: Preparation of binary membrane ultrafiltration (UF) toplayers (Al.sub.2 O.sub.3 -CeO.sub.2 and Alhd 2O.sub.3 -TiO.sub.2) to make chemically stable UF membranes and/or or catalytically active membranes. Two stable sols are prepared and mixed under controlled conditions and a top layer is prepared on a support under controlled conditions.
    Type: Grant
    Filed: May 16, 1990
    Date of Patent: July 9, 1991
    Assignee: Massachusetts Institute of Technology
    Inventors: Anthonie J. Burggraaf, Klaas Keizer, Cassilis T. Zaspalis