Patents by Inventor Daniel A. Holt

Daniel A. Holt 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).

  • Fluid pressure regulator
    Patent number: 5899221
    Abstract: A fluid pressure regulator capable of adjustably setting a cut-off pressure between an upper and a lower limit having a two-piece valve body where the two pieces are threadably joined such that adjusting the distance between the two pieces (34, 54) of the valve body moves a piston (12) stem valve operating a high pressure port (40) towards or away from the high pressure port while not changing the distance between a spring (84) engaging the piston (12) and the piston head (14).
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: May 4, 1999
    Inventors: Daniel A. Holt, Trevor K. Markham
  • Fluid pressure regulator
    Patent number: 5522421
    Abstract: A fluid pressure regulator capable of adjustably setting a cut-off pressure between an upper and a lower limit having a two-piece valve body where the two pieces are threadably joined such that adjusting the distance between the two pieces of the valve body moves a piston stem valve operating a high pressure port towards or away from the high pressure port while not changing the distance between the spring engaging the piston and the piston head.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: June 4, 1996
    Assignee: Daniel A. Holt
    Inventors: Daniel A. Holt, Trevor K. Markham
  • Fluid pressure regulator
    Patent number: 5411053
    Abstract: A fluid pressure regulator capable of adjustably setting a cut-off pressure between an upper and a lower limit having a two-piece valve body where the two pieces are threadably joined such that adjusting the distance between the two pieces of the valve body moves a piston stem valve operating a high pressure port towards or away from the high pressure port while not changing the distance between the spring engaging the piston and the piston head.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: May 2, 1995
    Assignee: Daniel A. Holt
    Inventors: Trevor K. Markham, Daniel A. Holt