What follows are the subclasses from one class of the Manual of Classification for US patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retrieve patent titles by entering the class/subclass in the box below.
Enter a class/subclass code here to get a list of patent titles. Use
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363-131 121-55A 14-.5
that is, no embedded spaces, class and subclass seperated by a dash, and any
subclass letters capitalized. Currently Design Patent titles (those in the
classes of the form Dxx.yy) are not retreivable.
Class Number: 291 Class Title: TRACK SANDERS Subclass Subclass Number Title 1 MISCELLANEOUS 2 WHEEL-SLIP CONTROL 3 FLUID DELIVERY 4 .Smoke and cinder 5 .Reversing 6 .Movable trap valve 7 .Gravity conversion 8 ..Bypass 9 ..Horizontal trap axis 10 ..Vertical trap axis 11.1 .Including sand trap 11.2 ..Multiple fluid inlets for delivery pipe 11.3 ..Specified means to alter inlet fluid flow 12 .Blast-nozzle cleaners 13 .Air ports and screens 14 BRAKE-HANDLE CONTROL 15 BRAKE-SYSTEM CONTROL 16 HAND-VALVE CONTROL 17 ALARMS 18 JET IN HOPPER 19 HEATERS 20 .Electric 21 .Steam 22 POWER-ACTUATED 23 .Electric 24 .Fluid 25 SAND FEEDERS 26 .Reversing 27 .Chain 28 .Oscillatory 29 ..Cup 30 ..Hopper 31 ..Spout cutoff 32 .Rotary 33 .Screw 34 .Longitudinal slide 35 .Pivoted slide 36 .Vertical plunger 37 ..Helical guide 38 SAND HOPPERS 39 .Wheel guard 40 .Dome 41 SAND-DELIVERY PIPE 42 .Cleaners 43 ..Fluid 44 .Flexible 45 .Telescopic 46 .Nozzles 47 ..Pivoted 48 SAND SCREENS