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US4590741A Expired / Lapsed US ⏱️ 0.0 years remaining

Skin packaging procedure using laminated anti-static material

Assignee: Raytheon Co
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Filing: 1985-07-22
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Granted: 1986-05-27
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Expires: 2005-07-22
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Abstract

Abstract A laminated packaging film useful for skin-packaging electrostatic-sensitive items and protecting the items from electrostatic damage during packaging and while the items are vacuumed, contained, and removed from packages. The film includes a pair of sheets of highly resistive, heat-sealable plastic between which is sandwiched a sheet of conductive, heat-sealable plastic. The film resists the buildup of static charges while the item is being packaged and forms a protective Faraday cage while the item is contained in the package.

Inventors

  • 👤 Stuart G. Long
  • 👤 Michael J. Maciocia

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 13:26
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 146 words
In a skin-packaging procedure wherein an electrostatically-sensitive item is skin-packaged by heating a heat-sealable plastic film to a semi-molten state, drawing a vacuum between the film, the item to be packaged, and a coated substrate, and then drawing the film over and around the item to form a heat-sealable bond with the coated substrate, the improvement comprising: an electrostatic-resistant, heat-sealable, plastic film including first and second outer layers of heat-sealable, electrically semi-conductive polyethylene, each having a surface resistivity exceeding 1×10 16 ohms per square, and a middle layer of heat-sealable polyethylene sandwiched between and bonded to said first and second outer layers and impregnated with a sloughable, electrically-conductive material providing said middle layer with a volume resistivity no more than 1×10 3 ohms per centimeter, wherein said electrically-conductive material is prevented from sloughing to contaminate said item by said first or said second semiconductive polyethylene layer.
Claim 2
Dependent Claim 146 words
In a skin-packaging procedure wherein an electrostatically-sensitive item is skin-packaged by heating a heat-sealable plastic film to a semi-molten state, drawing a vacuum between the film, the item to be packaged, and a coated substrate, and then drawing the film over and around the item to form a heat-sealable bond with the coated substrate, the improvement comprising: an electrostatic-resistant, heat-sealable, plastic film including first and second outer layers of heat-sealable, electrically semi-conductive polyethylene, each having a surface resistivity exceeding 1×10 16 ohms per square, and a middle layer of heat-sealable polyethylene sandwiched between and bonded to said first and second outer layers and impregnated with a sloughable, electrically-conductive material providing said middle layer with a volume resistivity no more than 1×10 3 ohms per centimeter, wherein said electrically-conductive material is prevented from sloughing to contaminate said item by said first or said second semiconductive polyethylene layer.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-05-26 1989-11-25 1990-05-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-05-26 1993-11-25 1994-05-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-05-26 1997-11-25 1998-05-27 $7700.00 Window Closed / Lapsed

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