Resources Contact Us Home
Browse by Category: Main > Engineering
Class Information
Number: 137/329.03
Name: Fluid handling > With repair, tapping, assembly, or disassembly means > With provision of alternate wear parts > Valve heads and/or seats > Opposite duplicate surfaces of unitary structure > Homogeneous material
Description: Devices relating to an homogeneous material forming the surfaces and their intermediate support.

Sub-classes under this class:

Class Number Class Name Patents
137/329.04 Valve heads 15

Patents under this class:

Patent Number Title Of Patent Date Issued
6401747 Gate valve Jun. 11, 2002
4909272 Gate valve Mar. 20, 1990
4393928 Apparatus for use in rejuvenating oil wells Jul. 19, 1983
4355784 Method and apparatus for controlling back pressure Oct. 26, 1982
4257442 Choke for controlling the flow of drilling mud Mar. 24, 1981
4243067 Ball type check valve Jan. 6, 1981
4190073 Choke for controlling the flow of drilling mud Feb. 26, 1980

  Recently Added Patents
Canopy light fixture
Preferential selection of candidates for delta compression
Light transformation particle and photobioreactor
Comparison of visual information
Self assembly of elements for displays
Variety corn line NPAA2720
Resistor-2 resistor (R-2R) digital-to-analog converter with resistor network reversal
  Randomly Featured Patents
Obtaining data from a remote storage device
Device for anchoring a ligament to an osseous structure for ligamentoplasty
Multi-rotation angle detection device
Humidity-sensing component composition
Foundations for head coverings
Plant pen
Beverage container
System and method for evaluating and troubleshooting a digital subscriber line system
Composite steel and ceramic gun barrels
Radio-frequency system in package including antenna