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
Bacterial superantigen vaccines
Error protection for pipeline resources
Categorization of design rule errors
Signal processing apparatus, display apparatus having the same, and signal processing method
Compounds with (1 E, 6E)-1,7-bis-(3,4-dimethoxyphenyl)-4,4-disubstituted-hepta-1,6-diene-3,5-d- ione structural scaffold, their biological activity, and uses thereof
Use of endogenous promoters in genetic engineering of Nannochloropsis gaditana
Power converter and method of power conversion
  Randomly Featured Patents
Automotive seat safety mechanism
Methods and systems for designing and/or selecting drilling equipment using predictions of rotary drill bit walk
Contoured surface eddy current inspection system
Unsaturated polyester-urethane prepolymer and its applications
Process for preparing electrostrictive polymers and resulting polymers and articles
Apparatus and method for measuring diode chip
Use of ID4 for diagnosis and treatment of cancer
Specimen sensing apparatus
Chemically stable, insecticidally active phosphoroamidothioate pellet compositions and methods for their manufacture
Ultrasound enlarged image display techniques