Patents by Inventor David Zingerman Zingerman

David Zingerman Zingerman 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: 6543331
    Abstract: A hydraulic lifting device provides a lifting of the massive objects, having a complex geometric form and includes a support plate rigidly connected to the plungers coupled with the body carrying a main plunger, comprising a main rod and a main hydraulic fluid cavity, a main, auxiliary and central hydraulic fluid channels, a main valve and valve, and wherein each plunger comprises a road and hydraulic cavity.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: April 8, 2003
    Inventor: David Zingerman Zingerman