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US 3,963,856 AGranted
Flexible, corrugated, plastic tubing having conductive helical bead
AssigneeSteward Plastics, Inc.
InventorsLennart L. Carlson, Douglas I. Hoiberg
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Abstract
The combination of a flexible, thin-walled plastic tube having thereon an external, electrically conductive, helical bead which is formed of a plastic mixed with a conductive material and which is heat sealed to the plastic of the tube. Electrical conductors are electrically connected to the bead adjacent the ends of the tube. The bead is normally opaque and the tube transparent. However, the tube may also contain a conductive material and be opaque.
Claims12
In a flexible, corrugated, electrically conductive, plastic tubing, the combination of:
- a. a flexible, thin-walled synthetic organic plastic tube;
- b. an electrically conductive, helical bead on and secured to the outer surface of said tube;
- c. said bead being a flexible synthetic organic plastic having mixed therewith an electrically conductive particulate material;
- d. said bead, and the outer surface of said tube intermediate the convolutions of said bead, constituting the outer surface of said tubing;
- and
- e. the inner surface of said tube constituting the inner surface of said tubing.
3 more elements
Dependencies are inferred from the claim text.