Patents by Inventor Richard C. Copeman

Richard C. Copeman 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).

  • Controlled release of trace elements
    Patent number: 4447254
    Abstract: A composition for providing a substantially controlled level of dissolved trace element in water comprises a trace element compound in a relatively insoluble form. Preferably the composition comprises a relatively insoluble trace element compound and a binder which results in the composition having a different solubility product to that of the trace element alone. The binder may be plaster of paris.
    Type: Grant
    Filed: July 22, 1981
    Date of Patent: May 8, 1984
    Assignee: McKenchnie Chemicals Limited
    Inventors: Alan C. Hughes, Richard C. Copeman, Thomas N. R. Marples