Resources Contact Us Home
Browse by Category: Main > Engineering
Class Information
Number: 137/389
Name: Fluid handling > Liquid level responsive or maintaining systems > With second diverse control
Description: Apparatus wherein the level responding or maintaining flow is increased or diminished by an external means or in response to a change in condition other than liquid level, either by a means acting upon the liquid level responsive control means or by a second means in series or parallel therewith.

Sub-classes under this class:

Class Number Class Name Patents
137/390 Manual control 41

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
4119116 Receptacle fill apparatus Oct. 10, 1978
4119016 Hydraulic control device Oct. 10, 1978
4111218 Absorption process method and apparatus Sep. 5, 1978
4073310 Method and apparatus for controlling the liquid level above a solid bed Feb. 14, 1978
4050447 Deep fat fryer heated fat supply reservoir and fat replenishment device Sep. 27, 1977
4039001 Water storage refill system Aug. 2, 1977

1 2

  Recently Added Patents
Resonant conversion system with over-current protection processes
Thin film switch and press key/keyboard using the same
Light emitting device
Motion estimation for a video transcoder
Transmitter having a programmable amplifier operating class
Organic light emitting device connection methods
Ion generation using wetted porous material
  Randomly Featured Patents
Testing method and testing apparatus
Method for evaluation of fluid flow within a simulated combustion chamber
Inflatable curtain
Extraction of camomile with liquid carbon dioxide
Fire-resistant material and process
Transparent fishing hook
Semiconductor memory device with redundancy function
Base for an automatic food dispenser
Photovoltaic module manufacture
Transfer apparatus, regulating apparatus and methods