Patent ID: 11865878
Assignee: AMERICAN KENDA RUBBER INDUSTRIAL CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 6:
7. An elastomeric pneumatic inner tube for use inside a tire, the inner tube comprising:
an endless tubular wall forming a substantially toroidal shape with a hollow interior for containing air;
a wall thickness of between about 0.5 millimeters-2 millimeters; and
a valve providing a pathway through the tubular wall by which air can be introduced into the hollow interior of the inner tube;
wherein, the inner tube exhibits a gas transmission rate above 55 cm3/m2 and less than 69 cm3/m2 over 24 hours at atmospheric pressure, and a permanent set value above 22% and less than 27% of less than 30% after stretching to 300% strain.