Patents by Inventor William Nai-Jen Chang

William Nai-Jen Chang 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: 20080060338
    Abstract: An ergonomically designed gardening tool such as a rake has an elongated handle slidably and removably mounted to the tool head. A spike or an auxiliary gardening implement is mounted at the lower end of the handle such that the spike may be operated to secure the rake at an upright free standing position on a lawn or solid ground surface. The handle is secured to tool head with a latch mechanism which is operative to secure or release the handle from the rake head selectively. The removed handle with the auxiliary implement mounted thereon may also be used for various gardening tasks.
    Type: Application
    Filed: September 11, 2006
    Publication date: March 13, 2008
    Inventor: William Nai-Jen Chang
  • Patent number: 6485076
    Abstract: A versatile attachment in the form of an elongated member having an obtuse angle is mounted on a shovel handle. The lower end of the elongated member is pivotally mounted in a cantilever manner to the lower portion of the shovel handle. The elongated member mounted with the obtuse angle portion of the elongated member located selectively either above or below the longitudinal axis of the shovel handle. A cross bar member is provided at the upper free end of the elongated member and a rotary wheel is rotatably mounted on the cross bar member. A strap is provided at the shovel handle and is operative for securing the attachment to the latter.
    Type: Grant
    Filed: March 8, 2001
    Date of Patent: November 26, 2002
    Inventor: William Nai-Jen Chang
  • Patent number: 6276645
    Abstract: This portable device is for holding and supporting a flexible waste collection bag in an open condition. The device has a frame consisting of two parallel side bars having a handle at one end and the free ends of the side bars are mounted to a lower supporting platform bar. A slider bar is slidably mounted on the side bars and located between the handle and the lower supporting platform bar. Both the slider bar and the supporting platform bar have a horizontal U-shaped channel. A flexible waste collection bag can be mounted to the device by wrapping two opposite sides of the lip portion of the bag on two securement bars and inserting the wrapped securement bars into the U-shaped channels in the slider bar and the supporting platform bar to secure the bag to the device. The slider is pushed upwards to maintain the bag in an open condition. Bags of a variety of different sizes may be mounted to the device by adjusting the position of the slider bar.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: August 21, 2001
    Inventor: William Nai-Jen Chang