{
  "$type": "site.standard.document",
  "description": "In a present invention, in a pneumatic tire 1A, a circumferential groove 32 extending in a tire circumferential direction is formed by land portions 20 constituting a tread surface 10 coming into contact with a road surface. A flat groove portion 60 and an in-groove land portion 70 are formed in…",
  "path": "/patents/1013983",
  "publishedAt": "2011-04-13T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C11/0304",
    "BRIDGESTONE CORP [JP]"
  ],
  "textContent": "In a present invention, in a pneumatic tire 1A, a circumferential groove 32 extending in a tire circumferential direction is formed by land portions 20 constituting a tread surface 10 coming into contact with a road surface. A flat groove portion 60 and an in-groove land portion 70 are formed in the circumferential groove 32. The flat groove portion 60 is a flat surface of a groove bottom 32a of the circumferential groove 32. The in-groove land portion 70 is raised toward the tread surface 10 side from the groove bottom 32a of the circumferential groove 32. Multiple narrow grooves 80 extending in a tread width direction are formed in the in-groove land portion 70. A wide-groove width W1 of the circumferential groove 32 in the tread width direction is 5 to 30% of a tread width TW of the tread surface in the tread width direction.",
  "title": "PNEUMATIC TIRE"
}