US4966280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple-ply anti-static paperboard
Assignee: Bradford Co Inc
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Filing: 1989-04-12
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Granted: 1990-10-30
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Expires: 2009-04-12
Abstract
Abstract A multiple-ply anti-static paperboard having a layer of high-carbon content fiberboard sandwiched between two plies of anti-static material, the anti-static material being an anti-static plastic or low-carbon content paperboard. Dividers and pads made of such multiple-ply paperboard are used to form a plurality of walled cells within a container, each of the cells completely enclosing a packaged article susceptible to electrostatic discharge. The conductive layer forms a Faraday cage to electrostatically shield the packaged article, and the anti-static layer prevents conductive dust from contacting and adversely affecting the packaged article, as well as protecting the packaged article against the generation of static electricity internally of the container.
Inventors
- 👤 Judson A. Bradford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:49
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0067; B; B65; B65D; B65D5/00; B65D5/42; B65D5/44; B65D5/48; B65D5/48024; B65D5/48026; B65D5/48038; B65D81/00; B65D81/24; Y; Y10; Y10S; Y10S493/00; Y10S493/901; Y10S493/906
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
129 words
A container for use with an article which can be damaged by static electricity, comprising: a box having sidewalls and top and bottom walls; a plurality of relatively rigid dividers located in said box, each said divider comprising a layer of electrically conductive material sandwiched between and contacting two layers of an anti-static material, said electrically conductive material having a surface resistivity of less than 10 5 ohms per square inch and said two layers of anti-static material having a surface resistivity of between 10 9 and 10 14 ohms per square inch; and wherein said dividers partially define a predetermined number of cells within said box, each said cell providing protection from both electrostatic discharge and conductive spall for a static electricity sensitive article to be packaged therein.
Claim 2
Dependent Claim
129 words
A container for use with an article which can be damaged by static electricity, comprising: a box having sidewalls and top and bottom walls; a plurality of relatively rigid dividers located in said box, each said divider comprising a layer of electrically conductive material sandwiched between and contacting two layers of an anti-static material, said electrically conductive material having a surface resistivity of less than 10 5 ohms per square inch and said two layers of anti-static material having a surface resistivity of between 10 9 and 10 14 ohms per square inch; and wherein said dividers partially define a predetermined number of cells within said box, each said cell providing protection from both electrostatic discharge and conductive spall for a static electricity sensitive article to be packaged therein.
Claim 3
Dependent Claim
84 words
A container as in claim 1 and further comprising: a relatively rigid top pad located between said top wall of said box and said dividers; a relatively rigid bottom pad located between said bottom wall of said box and said dividers; wherein each said pad comprises a layer of electrically conductive material sandwiched between two layers of an anti-static material; and said pads and said dividers completely surrounding said cells with a layer of electrically conductive material sandwiched between two layers of anti-static material.
Claim 4
Dependent Claim
16 words
A container as in claim 1 wherein said electrically conductive material comprises: a high-carbon content paperboard.
Claim 5
Dependent Claim
18 words
A container as in claim 1 wherein said anti-static material comprises: a plastic doped with an anti-static agent.
Claim 6
Dependent Claim
15 words
A container as in claim 1 wherein said anti-static material comprises: an anti-static plastic material.
Claim 7
Dependent Claim
14 words
A container as in claim 5 wherein said anti-static plastic material comprises low-density polyethylene.
Claim 8
Dependent Claim
36 words
A container as in claim 5 wherein said plastic material comprises a plastic which has been subjected to electron-beam radiation to impart said surface resistivity of between 10 9 and 10 14 ohms per square inch.
Claim 9
Dependent Claim
14 words
A container as in claim 1 wherein said anti-static material comprises: low-carbon content paperboard.
Claim 10
Dependent Claim
129 words
A container for use with an article which can be damaged by static electricity, comprising: a box having sidewalls and top and bottom walls; a plurality of relatively rigid dividers located in said box, each said divider comprising a layer of high-carbon content paperboard sandwiched between and contacting two layers of an anti-static material, said high-carbon content paperboard having a surface resistivity of less than 10 5 ohms per square inch and said two layers of anti-static material having a surface resistivity of between 10 9 and 10 14 ohms per square inch; and wherein said dividers partially define a predetermined number of cells within said box, each said cell providing protection from both electrostatic discharge and conductive spall for a static electricity sensitive article to be packaged therein.
Claim 11
Dependent Claim
129 words
A container for use with an article which can be damaged by static electricity, comprising: a box having sidewalls and top and bottom walls; a plurality of relatively rigid dividers located in said box, each said divider comprising a layer of high-carbon content paperboard sandwiched between and contacting two layers of an anti-static material, said high-carbon content paperboard having a surface resistivity of less than 10 5 ohms per square inch and said two layers of anti-static material having a surface resistivity of between 10 9 and 10 14 ohms per square inch; and wherein said dividers partially define a predetermined number of cells within said box, each said cell providing protection from both electrostatic discharge and conductive spall for a static electricity sensitive article to be packaged therein.
Claim 12
Dependent Claim
84 words
A container as in claim 9 and further comprising: a relatively rigid bottom pad located between said bottom wall of said box and said dividers; a relatively rigid top pad located between said top wall of said box and said dividers; wherein each said pad comprises a layer of high-carbon content paperboard sandwiched between two layers of an anti-static material; and said pads and said dividers completely surrounding said cells with a layer of high-carbon content paperboard sandwiched between two layers of anti-static material.
Claim 13
Dependent Claim
73 words
A multiple-ply material comprising: a first layer of anti-static material; a second layer of anti-static material; a third layer of relatively rigid, electrically conductive material sandwiched between and contacting said first and second layers; and wherein said first and second layers have a surface resistivity of between 10 9 and 10 14 ohms per square inch and said third layer has a surface resistivity of less than 10 5 ohms per square inch.
Claim 14
Dependent Claim
73 words
A multiple-ply material comprising: a first layer of anti-static material; a second layer of anti-static material; a third layer of relatively rigid, electrically conductive material sandwiched between and contacting said first and second layers; and wherein said first and second layers have a surface resistivity of between 10 9 and 10 14 ohms per square inch and said third layer has a surface resistivity of less than 10 5 ohms per square inch.
Claim 15
Dependent Claim
17 words
A multiple-ply material as in claim 11 wherein said electrically conductive material comprises: a high-carbon content paperboard.
Claim 16
Dependent Claim
19 words
A multiple-ply material as in claim 11 wherein said anti-static material comprises: a plastic doped with an anti-static agent.
Claim 17
Dependent Claim
16 words
A multiple-ply material as in claim 11 wherein said anti-static material comprises: an anti-static plastic material.
Claim 18
Dependent Claim
14 words
A multiple-ply material as in claim 14 wherein said anti-static material comprises: low-density polyethylene.
Claim 19
Dependent Claim
21 words
A multiple-ply material as in claim 14 wherein said plastic material comprises: plastic which has been subjected to high-energy, electron-beam radiation.
Claim 20
Dependent Claim
16 words
A multiple-ply material as in claim 11 wherein said anti-static material comprises: a low-carbon content paperboard.
Claim 21
Dependent Claim
16 words
A multiple-ply material as in claim 11 wherein said anti-static material further comprises: a corrosion inhibitor.
Claim 22
Dependent Claim
118 words
A method of manufacturing the multiple-ply antistatic material of claim 11 comprising the steps of: forming a relatively rigid interior ply of electrically conductive material, said interior ply having first and second surfaces and a surface resistivity of less than 10 5 ohms per square inch; forming a first outer ply of low-carbon content paperboard on said first surface of said interior ply; and forming a second outer ply of low-carbon content paperboard on said second surface of said interior ply, said first and second outer plies having a surface resistivity of between 10 9 and 10 14 ohms per square inch, thereby to provide a relatively rigid electrically conductive material sandwiched between two low-carbon content outer plies.
Claim 23
Dependent Claim
22 words
A method of manufacturing the multiple-ply antistatic material as in claim 19 wherein said electrically conductive material comprises a high-carbon content paperboard.
Claim 24
Dependent Claim
75 words
A multiple-ply paperboard comprising: a first layer of anti-static material; a second layer of anti-static material; a third layer of high-carbon content paperboard sandwiched between and contacting said first and second layers; and wherein said first and second layers have a surface resistivity of between 10 9 and 10 14 ohms per square inch and said third layer of high-carbon content paperboard has a surface resistivity of less than 10 5 ohms per square inch.
Claim 25
Dependent Claim
75 words
A multiple-ply paperboard comprising: a first layer of anti-static material; a second layer of anti-static material; a third layer of high-carbon content paperboard sandwiched between and contacting said first and second layers; and wherein said first and second layers have a surface resistivity of between 10 9 and 10 14 ohms per square inch and said third layer of high-carbon content paperboard has a surface resistivity of less than 10 5 ohms per square inch.
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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) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |