Patents by Inventor Jong-Nam Ma

Jong-Nam Ma 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: 5719935
    Abstract: A cellular telephone having a telephone receiver of an improved structure suitable to effectively exclude noise in noisy places thereby allowing a user to clearly hear the voice of a speaker is disclosed. The telephone receiver of this cellular telephone has an earphone type of conical projection suitable to be inserted into an earhole. The conical projection protrudes from the center of a circular base slightly protruding from the upper portion of the body's front surface so that the base comes into close contact with an ear rim when the conical projection is inserted into the earhole. The telephone transmitter of this cellular telephone is slidably received in a lower portion of a telephone body so as to manually or automatically retract into or project out of the body.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: February 17, 1998
    Inventor: Jong-Nam Ma
  • Patent number: 5348301
    Abstract: A head for use with a putter which is used to strike a golf ball gently so that the ball rolls across the putting green into a hole, includes a front hitting portion having a recess at the lower end thereof resulting in the head assuming an inverse U-shape. The hitting portion is inclined rearwardly and downwardly so that the time when the ball contacts with the head is maintained short, thus improving the correctness and applying a strong rotation force in the proceeding direction of the ball.
    Type: Grant
    Filed: June 10, 1993
    Date of Patent: September 20, 1994
    Inventor: Jong-Nam Ma