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US 4,044,799 AGranted
Cellular wall hose and method for making same
AssigneeThe Gates Rubber Company
InventorsCharles D. Higbee, Bennie A. Stevens
Life of this patent
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Abstract
A method for simultaneously extruding and foaming a seamless, closed cell, cellular, tubular conduit by extruding through no-land die and restricting foaming action until the conduit has been extruded. The resultant conduit can be made either uni-layer or multiple layer, with or without reinforcing with any of the layers foamed to produce an extremely flexible hose at a wide temperature range and having great resistance to kinking.
Claims2
An extruded, foamed, tubular product comprising:
- an inner seamless tube having a multitude of closed gas-filled cells interspersed throughout the walls of said tube;
- an outer cover comprising a wall structure having a multitude of gas-filled cells interspersed throughout said walls of the outer cover;
- and
- at least one intermediate seamless, closed cell, cellular layer contiguous to the next adjacent inner layer and the next concentric outer layer.
1 more element
Dependencies are inferred from the claim text.