Tread Patents (Class 152/209.1)
- Protrusion from bottom and spaced from both walls (e.g., pebble ejector, etc.) (Class 152/209.19)
- Protrusion from wall and spaced from the opposite wall (Class 152/209.21)
- Protrusion bridging between walls (e.g., tie bar, etc.) (Class 152/209.22)
- Both walls inclined in same direction (Class 152/209.23)
- Having angle of inclination of one wall different from that of opposite wall (Class 152/209.24)
- Having grooves or sipes with different specified depths (Class 152/209.25)
- Having circumferential groove width at least 10% per cent of tread width (Class 152/209.26)
- Having continuous circumferential narrow width groove (i.e., less than 5mm.) (Class 152/209.27)