US4987997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging bag
Assignee: Crowell Corp
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Filing: 1988-05-31
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Granted: 1991-01-29
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Expires: 2008-05-31
Abstract
Abstract A bag for holding and protecting articles sensitive to mechanical damage as well as to electric fields, the walls of the bag being essentially a layer of cushiony microfoam about 1 to about 4 millimeters thick, an essentially unfoamed polyethylene coating about 25 to about 100 microns thick on the inside surface of the microfoam, an essentially unfoamed support layer on the opposite surface of the microfoam, at least one face of the support layer being treated to protect the bag contents against external electric fields, and the polyethylene coating carrying sufficient antistat to protect the bag contents against the build-up of static electricity to the intensity that damages those contents when they are slid into the bag.
Inventors
- 👤 Lewis R. Raszewski
- 👤 Jerome J. Kipnees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:39
CPC Classifications
A; A01; A01G; A01G13/00; A01G13/20; A01G13/27; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10T; Y10T428/00; Y10T428/13; Y10T428/24; Y10T428/24942
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
118 words
A bag for cushioning and protecting articles sensitive to mechanical damage as well as to electric fields, the walls of the bag being essentially a layer of cushiony microfoam about 1 to about 4 millimeters thick, an essentially unfoamed polyethylene coating about 25 to about 100 microns thick on the inside surface of the microfoam, an essentially unfoamed support layer on the opposite surface of the microfoam, at least one face of the support layer being treated to protect the bag contents against external electric fields, and the polyethylene coating carrying sufficient antistat to protect the bag contents against the build-up of static electricity to the intensity that damages those contents when they are slid into the bag.
Claim 2
Dependent Claim
118 words
A bag for cushioning and protecting articles sensitive to mechanical damage as well as to electric fields, the walls of the bag being essentially a layer of cushiony microfoam about 1 to about 4 millimeters thick, an essentially unfoamed polyethylene coating about 25 to about 100 microns thick on the inside surface of the microfoam, an essentially unfoamed support layer on the opposite surface of the microfoam, at least one face of the support layer being treated to protect the bag contents against external electric fields, and the polyethylene coating carrying sufficient antistat to protect the bag contents against the build-up of static electricity to the intensity that damages those contents when they are slid into the bag.
Claim 3
Dependent Claim
78 words
A plastic bag having front and back panels secured to each other so that one edge of each defines a mouth for the bag, one of the panels having an extension in the form of a flap that folds over the other panel to cover the mouth, the extension being adhered to said one panel in such a way as to yieldably hold the flap in the fold-over position while permitting the flap to be unfolded when necessary.
Claim 4
Dependent Claim
78 words
A plastic bag having front and back panels secured to each other so that one edge of each defines a mouth for the bag, one of the panels having an extension in the form of a flap that folds over the other panel to cover the mouth, the extension being adhered to said one panel in such a way as to yieldably hold the flap in the fold-over position while permitting the flap to be unfolded when necessary.
Claim 5
Dependent Claim
67 words
A heat-sealable sheet of cushiony microfoam about 1 to about 4 millimeters thick, an essentially unfoamed polyethylene surface on one face of the sheet, and a strong support layer on the opposite face of the sheet, the polyethylene surface carrying sufficient antistat to prevent build-up of damaging antistatic electricity when articles are slid along that surface, and the support layer being treated to form an electrical shield.
Claim 6
Dependent Claim
67 words
A heat-sealable sheet of cushiony microfoam about 1 to about 4 millimeters thick, an essentially unfoamed polyethylene surface on one face of the sheet, and a strong support layer on the opposite face of the sheet, the polyethylene surface carrying sufficient antistat to prevent build-up of damaging antistatic electricity when articles are slid along that surface, and the support layer being treated to form an electrical shield.
Claim 7
Dependent Claim
12 words
The combination of claim 1 in which the polyethylene is low-density polyethylene.
Claim 8
Dependent Claim
12 words
The combination of claim 3 in which the polyethylene is low-density polyethylene.
Claim 9
Dependent Claim
29 words
The combination of claim 2 in which the adherence of the extension to its panel is by an essentially linear heat-seal adjacent to but spaced from the fold-over bight.
Claim 10
Dependent Claim
19 words
The combination of claim 6 in which the heat-seal is between surfaces of readily heat-sealable low molecular weight polyethylene.
Claim 11
Dependent Claim
12 words
The combination of claim 1 in which the bag is essentially transparent.
Claim 12
Dependent Claim
56 words
The combination of claim 8 in which the support layer treatment that protects the bag contents against external electric fields is a layer of essentially transparent binder in which is dispersed about 1/2% to about 1% by weight of metal or metalcoated fibers at least about 3 millimeters long and not over about 20 microns thick.
Claim 13
Dependent Claim
18 words
The combination of claim 8 in which the foam is so highly reticulated as to be essentially transparent.
Claim 14
Dependent Claim
12 words
The combination of claim 3 in which the sheet is essentially transparent.
Claim 15
Dependent Claim
56 words
The combination of claim 11 in which the support layer treatment that protects the bag contents against external electric fields is a layer of essentially transparent binder in which is dispersed about 1/2% to about 1% by weight of metal or metal-coated fibers at least about 3 millimeters long and not over about 20 microns thick.
Claim 16
Dependent Claim
18 words
The combination of claim 11 in which the foam is so highly reticulated as to be essentially transparent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |