Loading patent…
AssigneeMinnesota Mining and Manufacturing Company
InventorsDonald M. Yenni, Jr., Steven W. Knutsen, Edward J. Downing
Estimating the term…
A flexible sheet material for forming an envelope used to enclose and protect electronic components from electrostatic charges during storage and shipment. The sheet material is sufficiently transparent to afford visual identification of an electronic component through the envelope, while including a polymeric sheet having a high volume resistivity to electrically isolate a component within the envelope, an antistatic material which is disposed at an inner surface of the envelope for dissipating and restricting electrostatic charges on components within the envelope, and a highly conductive layer which is then disposed on the outer surface of the polymeric sheet and provides a highly conductive outer surface on the envelope for grounding electrostatic charges brought into contact with the envelope.
A flexible sheet material having first and second major surfaces adapted for forming an envelope with said second surface defining the inner surface of the envelope, which envelope can receive and electrically protect an electronic component, said sheet material comprising a self-supporting electrically insulating polymeric sheet having a volume resistivity of at least about 10.sup.10 ohm-centimeters, an organic antistatic material providing a surface resistivity on said second surface in the range of 10.sup.8 to 10.sup.14 ohms per square, and a conductive layer on the surface of said polymeric sheet opposite said second surface providing a surface resistivity on said first surface of no greater than 10.sup.4 ohms per square, said sheet material being sufficiently transparent to afford visual identification of an electrical component through the sheet material.
Dependencies are inferred from the claim text.