Patents by Inventor Ik Hyun Hwang

Ik Hyun Hwang 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: 5788407
    Abstract: Described is a paving method of fine water-permeable concrete which can be used for roadways, sidewalks, bikeways, parking lots, public squares, etc. A base layer of water-permeable concrete is paved by spreading and pounding a sand filter layer and a rubble base layer on the consolidated ground to have porosity after pounding of 10-20% and a coefficient of water permeability of more than 10.times.10.sup.-2 cm/sec. A mixture of crushed waste glass, fine rubble, 250-500 kg/m.sup.3 of cement, water at a water-cement ratio of 25-40%, and a polymer in an amount of 10-50% of the weight of cement used based on 50% solid material is spread on the base layer and pounded. The concrete is aged for more than one day, a mixture of a polymer and water was sprayed on the base layer to be absorbed, after which aging is done to complete the construction.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: August 4, 1998
    Inventor: Ik Hyun Hwang