Patents by Inventor Leo Mackta

Leo Mackta 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).

  • Device for reducing low frequency electromagnetic fields in an electric blanket and method
    Patent number: 5912811
    Abstract: A device and method for reducing low frequency electromagnetic fields in an electric blanket includes an input, a rectifier filter, and a pair of closely spaced resistance wires. The input is connected to a 60 Hz AC power source to supply power to the electric blanket. The rectifier filter rectifies the input signal and filters out any high order components. The rectifier filter provides a filtered DC signal to apply across the paired resistance wires. In one embodiment, the device and method includes an output for connecting to a conventional electric blanket where the rectifier filter provides a filtered DC signal to the output.
    Type: Grant
    Filed: October 16, 1997
    Date of Patent: June 15, 1999
    Inventor: Leo Mackta
  • Pigment package for dental filling materials
    Patent number: 3932938
    Abstract: A pad of sheets each containing a plurality of discrete, premeasured quantities of pigments for producing natural colors in composite plastic dental filling materials, said pigments being adhered to said sheets by a hardened vehicle in which said pigments are dispersed, and said pigments in said vehicle being directly dispersible in said filling materials when brought into contact therewith.
    Type: Grant
    Filed: December 11, 1972
    Date of Patent: January 20, 1976
    Inventor: Leo Mackta