Patents by Inventor Helmut W. Majewski

Helmut W. Majewski 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).

  • Dicalcium phosphate dihydrate having improved monofluorophosphate compatibility and process for the preparation thereof
    Patent number: 4496527
    Abstract: Dicalcium phosphate dihydrate compositions having improved monofluorophosphate compatibility are prepared by adding pyrophosphoric acid to the dicalcium phosphate dihydrate reactor and terminating the reaction by which the dicalcium phosphate dihydrate is formed at a pH ranging from above about 2.2 to below about 4.9.
    Type: Grant
    Filed: July 8, 1983
    Date of Patent: January 29, 1985
    Assignee: Stauffer Chemical Company
    Inventors: Fawzy G. Sherif, Helmut W. Majewski, Francis A. Via
  • Dicalcium phosphate dihydrate having improved monofluorophosphate compatibility and process for the preparation thereof
    Patent number: 4487749
    Abstract: Dicalcium phosphate dihydrate compositions having improved monofluorophosphate compatibility are prepared by reacting a lime slurry with phosphoric acid to form a monocalcium phosphate solution, and then further reacting the monocalcium phosphate solution with additional lime slurry to a pH in the range of from above about 2.2 to below about 5.5.
    Type: Grant
    Filed: July 8, 1983
    Date of Patent: December 11, 1984
    Assignee: Stauffer Chemical Company
    Inventors: Fawzy G. Sherif, Helmut W. Majewski, Francis A. Via
  • Process for removing mercury from brine sludges
    Patent number: 4124459
    Abstract: The mercury content of electrolysis cell brine sludge is reduced by sequentially: (1) acidifying the sludge to a pH below 2.5 and (2) leaching the sludge with aqueous hypochlorite solvent. The mercury content removed from the sludge may optionally be isolated from the solvent and reused as mercury cathode for brine electrolysis.
    Type: Grant
    Filed: July 21, 1977
    Date of Patent: November 7, 1978
    Assignee: Stauffer Chemical Company
    Inventors: Julian E. Blanch, Helmut W. Majewski
  • Disposal of heavy metal containing sludge wastes
    Patent number: 4113504
    Abstract: The heavy metal content of sludge waste is fixed in a cementitious solid product by mixing the waste sludge with fixing ingredients comprising vermiculite and cement.
    Type: Grant
    Filed: October 3, 1977
    Date of Patent: September 12, 1978
    Assignee: Stauffer Chemical Company
    Inventors: Kon S. Chen, Helmut W. Majewski