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
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.
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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 |