Patents by Inventor C. Charles Lewchalermwong

C. Charles Lewchalermwong 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).

  • Process for manufacture of ferric nitrate
    Patent number: 4808393
    Abstract: A novel process for the manufacture of an aqueous ferric nitrate solution is provided. This process overcomes the passivation problem associated with the reaction of nitric acid and iron. The process is effected at a critical reaction temperature less than the ferric nitrate-to-ferric oxide decomposition temperature, thereby yielding a reaction product low in ferric oxide. The process involves repeated cycling of nitric acid through a bed of pieces of iron.
    Type: Grant
    Filed: September 18, 1987
    Date of Patent: February 28, 1989
    Assignee: Mineral Research and Development Corp.
    Inventor: C. Charles Lewchalermwong
  • Fire retardant composition
    Patent number: 4725382
    Abstract: A fire retardant composition that utilizes pH control to lower corrosion is provided. The fire retardant composition contains B.sub.2 O.sub.3, P.sub.2 O.sub.5 and NH.sub.3. Also provided is a fire retarded material of low corrosiveness.
    Type: Grant
    Filed: April 3, 1986
    Date of Patent: February 16, 1988
    Assignee: Chemical Specialties, Inc.
    Inventor: C. Charles Lewchalermwong