Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Train car for proppant containers
Fluorescent dyes, fluorescent dye kits, and methods of preparing labeled molecules
Incrementally increasing deployment of gateways
Electrostatic charger and image forming apparatus
Solar powered charging shelter and system and method thereof
Module-code verification layer to automatically validate user input
Use of deuterium oxide for the treatment of virus-based diseases of the respiratory tract
  Randomly Featured Patents
Removable fastener capable of elastic deformation
Removable cores for metal castings
Titanium-containing and cobalt-containing manganese-zinc ferrite core and method of manufacturing same
Workflow execution plans through completion condition critical path analysis
Noise filter for video processing
Nut cage and mount
Pesticidal compositions
Tilting rotary furnace system for recovery of non-ferrous metals from scrap or dross and method of operation
Organic compound, anthracene derivative, and light-emitting element, light-emitting device, and electronic device using anthracene derivative
Intelligent deck apparatus and method for positioning workpieces in preparation for processing