Patents by Inventor Pak Yiu Ho

Pak Yiu Ho 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).

  • Publication number: 20120111641
    Abstract: The submitted design has same functions and usage as conventional drill heads. It consists of two parts, a solid and a recess truncated cone with 4 sets of troughs and teeth. The two parts are locked together with 4 slotted spring pins. The highly worn drill head can be detached and replaced even with one of different size or different type if needed. Such design feature is thus highly versatile and economical. The design ensures even distribution and absorption of impact force and torque. The integrity of the whole structure while drilling is thus maintained.
    Type: Application
    Filed: November 10, 2011
    Publication date: May 10, 2012
    Inventor: Pak Yiu Ho