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US 5,855,036 AGranted
Static dissipative vacuum wand
OwnerRichard P. Krockinventor
Life of this patent
Estimating the term…
Abstract
A wand for use in a vacuum system that is made from rigid or non-rigid polymeric materials that have static dissipative qualities so that any static discharge event will be at low enough energy levels so as not to pose a hazard to humans and will be well below the minimum ignition energy for many industrial powders and dusts.
Claims8
A wand for pneumatic transfer of bulk solids comprising:
- a tubular member adapted to be attached to a vacuum hose and being made entirely of a rigid, non-flexible static dissipative polymeric material free of metal or carbon having a volume resistivity in the range of 10.sup.10 to 10.sup.12 ohm-cm and a surface resistivity in the range of 10.sup.10 to 10.sup.12 ohm per square centimeter.
A wand for pneumatic transfer of bulk solids comprising:
- a tubular member adapted to be attached to a vacuum hose and being made entirely of a rigid, non-flexible static dissipative polymeric material free of metal or carbon and having a volume resistivity in the range of 10.sup.10 to 10.sup.12 ohm-cm and a surface resistivity in the range of 10.sup.10 to 10.sup.12 ohm per square centimeter;
- and
- a concentric tube element attached to and in contact with the tubular member and having outer air channels for feeding ambient air to the tip of the wand for fluidizing the bulk solid material.
Dependencies are inferred from the claim text.