Patents by Inventor Hubert Harold Chambers

Hubert Harold Chambers 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: 4115144
    Abstract: A high solids metal oxides coated titanium dioxide aqueous slurry requires a negative charge and a high pH for use in aqueous paint media. A hot ageing of the coated titanium dioxide can alter the isoelectric point of the slurry and make practicable the avoidance of mixtures of metal oxide coating agents which give rise to processing difficulties and the use of mixtures of metal oxides which would not without the hot ageing step give suitable charge and pH characteristics. An example of a suitable mixture of metal oxide coating agents is a 1:1 molar Al.sub.2 O.sub.3 : TiO.sub.2 mixture. An example of hot ageing conditions is the use of a temperature of C - C for 1 hour while avoiding loss of water and under alkaline conditions.
    Type: Grant
    Filed: December 2, 1976
    Date of Patent: September 19, 1978
    Assignee: Laporte Industries Limited
    Inventors: Hubert Harold Chambers, Brian John Tear