06386253 is referenced by 3 patents and cites 7 patents.

A tire having a ground contacting tread comprising tread grooves which divide the tread into a plurality of tread pattern elements provided on its radially outer surface with a radially outwardly projecting ridge disposed on an edge of the pattern element and at least one radially inwardly projecting small groove extending to the projecting ridge which facilitates the dispersal of trapped air in the molding and vulcanization operation of the tire manufacturing process.

Title
Tire including block having continuous ridge and small groove
Application Number
9/336600
Publication Number
6386253 (B1)
Application Date
June 21, 1999
Publication Date
May 14, 2002
Inventor
Peter Robert Marriott
Hurley Common
US
Agent
Birch Stewart Kolasch & Birch
US
Assignee
Sumitomo Rubber
US
IPC
B60C 11/11
View Original Source