{
  "$type": "site.standard.document",
  "description": "A pneumatic tire includes, on a tread surface, a plurality of circumferential main grooves extending in the tread circumferential direction, and a plurality of land portions defined by circumferential main grooves adjacent in the tread width direction among the plurality of circumferential main…",
  "path": "/patents/1322769",
  "publishedAt": "2022-07-21T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C11/0306",
    "BRIDGESTONE CORPORATION"
  ],
  "textContent": "A pneumatic tire includes, on a tread surface, a plurality of circumferential main grooves extending in the tread circumferential direction, and a plurality of land portions defined by circumferential main grooves adjacent in the tread width direction among the plurality of circumferential main grooves, or by the circumferential main grooves and tread edges. A widthwise groove (widthwise sipe) (circumferential sipe) includes a widened portion, on the groove bottom side (sipe bottom side), at which the groove width (sipe width) is larger than on the tread surface side. In a tire radial direction region including at least a reference depth position, the storage modulus of first tread rubber, which is a groove wall surface layer defined by the widened portion and covering at least part of the widened portion, is larger than the storage modulus of second tread rubber located in a region around the first tread rubber.",
  "title": "PNEUMATIC TIRE"
}