US Patent Class 172
EARTH WORKING-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
1  DF  PROCESSES
2  DF  AUTOMATIC POWER CONTROL {5}
13  DF  LAWN EDGER {4}
19  DF  SOD CUTTER {1}
21  DF  LAWN AERATOR OR PERFORATOR, OR PLUG REMOVER {1}
23  DF  DRIVEN FROM OR GUIDED BY STATIONARY OBJECT, OR ANCHORED {4}
27  DF  WITH MEANS FOR CUTTING OR SHREDDING PLANTS WITHOUT SOIL DISTURBANCE {1}
29  DF  WITH MEANS FOR SHIFTING SURFACE MATERIAL WITHOUT SOIL DISTURBANCE {2}
32  DF  WITH SEPARATING AFTER EARTH WORKING
33  DF  WITH POWER DRIVEN MOLDBOARD, CONVEYER OR HANDLER
34  DF  COMPLETE APPARATUS ADAPTED FOR USE UPSIDE DOWN
35  DF  WITH DRIVE MEANS FOR TOOL OR CLEANER {37}
126  DF  WITH EARTH MARKER {5}
777  DF  SCRAPER SUPPORTS NARROW DEPENDING TOOL {1}
779  DF  SCRAPER POSITION AUTOMATICALLY CONTROLLED BY LINKAGE FOR LEVELLING
780  DF  SCRAPER BETWEEN WIDELY SPACED FRONT AND REAR GROUND SUPPORTS
781  DF  SCRAPER BETWEEN FRONT AND REAR GROUND SUPPORTS OF VEHICLE {12}
799.5  DF  TOWED SCRAPER WITH GROUND SUPPORT WHEELS
133  DF  DIVERSE TOOLS {29}
204  DF  ALTERNATING FOR RIGHT OR LEFT HAND OPERATION (OTHER THAN SCRAPER) {10}
233  DF  WITH OBSTRUCTION FEELER FOR MOVING OR RELEASING IMPLEMENT TO AVOID OBSTRUCTION (INCLUDES DAM FORMER) {1}
236  DF  GROUND ENGAGEABLE DRAFT RESPONSIVE LEVER {1}
238  DF  GROUND SUPPORT MOVED VERTICALLY RELATIVE TO FRAME BY DRAFT MEANS
239  DF  DRAFT, PITCH OR GROUND LEVEL RESPONSIVE DEPTH CONTROL
240  DF  WITH GROUND SUPPORT ENGAGEABLE WITH GROUND FOR TRANSPORT ONLY {4}
245  DF  CONVERTIBLE; OR CHANGEABLE BY DISASSEMBLY OR ASSEMBLY {5}
255  DF  TURN LIFTS TOOL OFF OR LOWERS TOOL INTO GROUND
256  DF  PROPULSION UNIT GUIDED BY WALKING ATTENDANT OR PART OF ARTICULATED VEHICLE {4}
260.5  DF  HAVING TOOL OVERLOAD SHIFT CONTROLLED BY A FLUID PRESSURE DEVICE
261  DF  OVERLOAD SHIFTING {6}
272  DF  WITH MEANS TO FACILITATE MOUNTING OF IMPLEMENT ON MOTOR VEHICLE {3}
810  DF  MOUNTING FOR PUSHED TOOL AT END OF MOTOR VEHICLE {3}
278  DF  WITH WHEEL STEERING OR ACTUATOR FOR HORIZONTALLY ANGLING WHEEL AXIS {3}
292  DF  SPECIFIC PROPELLING MEANS
293  DF  SERIES OF LIKE ELEMENTS SEQUENTIALLY OPERATED BY POWER CYCLE {3}
297  DF  TOOL FORWARD OF REAR OF MOTOR VEHICLE {10}
310  DF  PLURAL WHEELED IMPLEMENTS {4}
315  DF  ACTUATOR ON TRAILING IMPLEMENT, CONTROLLED FROM PROPELLING VEHICLE {1}
317  DF  ACTUATOR ON VEHICLE FOR RELATIVELY MOVING PARTS OF TRAILING IMPLEMENT {2}
321  DF  ACTUATOR ON VEHICLE FOR MOVING WHEELED IMPLEMENT
322  DF  WITH ACTUATOR FOR ROCKING TOOL ABOUT WHEEL AXIS {1}
324  DF  WITH ACTUATOR ON TRAILING GROUND SUPPORTED FRAME FOR MOVING DRAFT MEANS LATERALLY OR VERTICALLY {2}
329  DF  GUIDED BY WALKING ATTENDANT; SUPPORTED, PROPELLED, OR HELD IN POSITION BY ATTENDANT {7}
382  DF  MULTIPLE LEVEL TOOLS
383  DF  AXIS OF ROTATION OF WHEEL LOCKABLE OR ANGULARLY ADJUSTABLE {3}
387  DF  WITH WHEEL SUBSTITUTE (E.G., RUNNER, ETC.) {6}
395  DF  WITH GROUND SUPPORT VERTICALLY ADJUSTABLE RELATIVE TO FRAME {10}
430  DF  WITH INDICATING OR SIGHTING MEANS
431  DF  WITH SEAT OR ATTENDANT'S STATION {5}
437  DF  WITH TOOL SHARPENER
438  DF  COMBINED
439  DF  MAST TYPE HITCH (E.G., THREE POINT HITCH, ETC.) {10}
452  DF  WITH ACTUATOR ADAPTED TO LIFT TOOL FOR TRANSPORT ON WHEELED FRAME OR BROADLY CLAIMED IMPLEMENT {37}
507  DF  GROUND SUPPORT MOVABLE HORIZONTALLY
508  DF  WITH GUARD, SHIELD OR PLANT DIVERTER {3}
518  DF  ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30}
605  DF  SHIFTABLE HITCH MOVES TOOL RELATIVE TO FRAME
606  DF  WITH CLEANER {4}
611  DF  WITH WEIGHT
612  DF  FABRIC OR FLEXIBLE TOOL
613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
663  DF  WITH ACTUATOR {4}
669  DF  WITH WHEEL; OR SUPPORTED ON WHEEL FRAME OR BROADLY CLAIMED IMPLEMENT {6}
677  DF  WITH DRAFT DETAIL {2}
681  DF  TOOL, STANDARD OR CONNECTION {32}
776  DF  MISCELLANEOUS (E.G., FRAMES, ETC.)
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CROSS-REFERENCE ART COLLECTION
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900  DF  PLANT THINNERS