Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Construction
Class Information
Number: 172/90
Name: Earth working > With drive means for tool or cleaner > Irregular or off-center ground-engaging wheel or support
Description: Apparatus in which an earth working element which is supported on a frame is moved towards and away from the earth by a lifting member which is rotatably or pivotally supported on an axis on said frame and has circumferential portions which extend radially to varying distances from said axis in such fashion that said lifting member engages the earth and periodically lifts the frame and the earth working element.










Patents under this class:

Patent Number Title Of Patent Date Issued
6151811 Retractable assembly for trenchers and walk-behind power units Nov. 28, 2000
5673757 Ground opening device Oct. 7, 1997
4227579 Dike producing device Oct. 14, 1980
4213502 Self tripping dammer Jul. 22, 1980
4155315 Mobile spreader May. 22, 1979
4002206 Ditcher Jan. 11, 1977











 
 
  Recently Added Patents
Charged particle source with multiple selectable particle emitters
Eyeglass component
Nonvolatile semiconductor memory device and method of manufacturing the same
Apparatus and method for performing lawful intercept in group calls
Method of manufacturing pipe with branch
Photomask blank, photomask blank manufacturing method, and photomask manufacturing method
Diagnostic data interchange
  Randomly Featured Patents
Presser foot for zigzag sewing machines
Electric hotplate
Multi-player, multi-character cooperative play video game with independent player entry and departure
Infrared imaging system employing on-focal plane nonuniformity correction
Iron effect pigments
Escalator passenger flow control
Security system
Contention free pipelined broadcasting within a constant bisection bandwidth network topology
Surface-emitting laser and method for producing the same
Continuous-stream upflow zeolite crystallization apparatus