Patents by Inventor An Ma

An 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).

  • Cordless patio umbrella
    Patent number: 6374840
    Abstract: A patio umbrella has a pole, a plurality of primary ribs extending from the pole, a hub slidably supported on the pole, and a plurality of secondary ribs, each secondary rib having a first end pivotally coupled to the hub and a second end pivotally coupled to one of the primary ribs. The patio umbrella has a ledge positioned on the pole, and a spring slidably supported on the pole between the hub and the ledge. The patio umbrella can also have at least one stretcher having a first end pivotally coupled to one of the secondary ribs, and a second end pivotally coupled to the ledge.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: April 23, 2002
    Assignee: Treasure Garden, Inc.
    Inventor: Oliver Joen-An Ma
  • Umbrella base having adjustable weights
    Patent number: 6113054
    Abstract: A patio umbrella base has a base housing that has a central opening, and an interior wall configured to define an interior space, with a shaft extending from the central opening. A first weight is secured to the interior wall of the base housing and retained inside the interior space, and a second weight is removably secured to the base housing and retained inside the interior space.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: September 5, 2000
    Inventor: Oliver Joen-An Ma