US4208696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive web
Assignee: 3M Co
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Filing: 1978-07-19
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Granted: 1980-06-17
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Expires: 1998-07-19
Abstract
Abstract An electrically conductive web for safely and quickly discharging static electricity accumulated on personnel is disclosed. The web comprises a semi-conductive polymeric surface layer, which is in electrical contact with a conductive foraminous layer. The relative conductivity of these layers result in desirable electrical discharge characteristics. The composite structure may be bonded to a suitable supporting substrate and suitable electrical connection between the conductive foraminous layer is made with an electrical ground. Charged personnel coming into contact with the semi-conductive surface layer have their static charge quickly and safely discharged to ground potential.
Inventors
- 👤 Thomas W. Lindsay
- 👤 Walter M. Westberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:37
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; H; H05; H05F; H05F3/00; H05F3/02; H05F3/025; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/30; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/15
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
A conductive web for discharging a static electric charge impressed thereon comprising: a layer of semiconductive thermoplastic polymeric material with a volume resistivity between 1×10 7 and 1×10 12 ohm-cm, in direct physical and electrical connection with, a foraminous layer, coated with carbon loaded resinous material to impart a resistivity of between 10 3 ohms and 10 7 ohms, forming a completed conductive web and, conductive means in electrical contact with said foraminous layer for connecting said foraminous layer to ground potential.
Claim 2
Dependent Claim
82 words
A conductive web for discharging a static electric charge impressed thereon comprising: a layer of semiconductive thermoplastic polymeric material with a volume resistivity between 1×10 7 and 1×10 12 ohm-cm, in direct physical and electrical connection with, a foraminous layer, coated with carbon loaded resinous material to impart a resistivity of between 10 3 ohms and 10 7 ohms, forming a completed conductive web and, conductive means in electrical contact with said foraminous layer for connecting said foraminous layer to ground potential.
Claim 3
Dependent Claim
102 words
A conductive web for discharging a static electric charge impressed thereon comprising: a layer of semiconductive thermoplastic polymeric material formed from a resin consisting essentially of a copolymer resin of 95% polyvinyl chloride and 5% polyvinyl acetate plasticized with diisodecyl phthalate and epoxidized soybean oil exhibiting a volume resistivity between 1×10 7 and 1×10 12 ohm-cm in direct physical and electrical contact with, a foraminous layer coated with carbon loaded resinous material to impart a resistivity of between 10 3 and 10 7 ohms, and conductive means in electrical contact with said foraminous layer for connecting said foraminous layer to ground potential.
Claim 4
Dependent Claim
102 words
A conductive web for discharging a static electric charge impressed thereon comprising: a layer of semiconductive thermoplastic polymeric material formed from a resin consisting essentially of a copolymer resin of 95% polyvinyl chloride and 5% polyvinyl acetate plasticized with diisodecyl phthalate and epoxidized soybean oil exhibiting a volume resistivity between 1×10 7 and 1×10 12 ohm-cm in direct physical and electrical contact with, a foraminous layer coated with carbon loaded resinous material to impart a resistivity of between 10 3 and 10 7 ohms, and conductive means in electrical contact with said foraminous layer for connecting said foraminous layer to ground potential.
Claim 5
Dependent Claim
100 words
A conductive web for discharging a static electric charge impressed thereon comprising: a layer of semiconductive thermoplastic polymeric material formed from a resin consisting essentially of cellulose acetate butyrate plasticized with a low viscosity monomeric plasticizer characterized as a butyl-capped, ethylene oxide oligmer exhibiting a volume resistivity between 1×10 7 ohm-cm and 1×10 12 ohm-cm, in direct physical and electrical connection with, a foraminous layer, coated with carbon loaded resinous material to impart a resistivity between 1×10 3 and 1×10 7 ohms and conductive means in electrical contact with said foraminous layer for connecting said foraminous layer to ground potential.
Claim 6
Dependent Claim
100 words
A conductive web for discharging a static electric charge impressed thereon comprising: a layer of semiconductive thermoplastic polymeric material formed from a resin consisting essentially of cellulose acetate butyrate plasticized with a low viscosity monomeric plasticizer characterized as a butyl-capped, ethylene oxide oligmer exhibiting a volume resistivity between 1×10 7 ohm-cm and 1×10 12 ohm-cm, in direct physical and electrical connection with, a foraminous layer, coated with carbon loaded resinous material to impart a resistivity between 1×10 3 and 1×10 7 ohms and conductive means in electrical contact with said foraminous layer for connecting said foraminous layer to ground potential.
Claim 7
Dependent Claim
18 words
The conductive web of claim 1 wherein said foraminous layer is characterized as an open cell polymeric foam.
Claim 8
Dependent Claim
18 words
The conductive web of claim 1 wherein said foraminous layer is characterized as an open weave textile scrim.
Claim 9
Dependent Claim
35 words
The conductive web of claim 1 wherein said conductive means in electrical contact with said foraminous layer is characterized as a metallic grommet which perforates the completed conductive web and passes through said foraminous layer.
Claim 10
Dependent Claim
16 words
The conductive web of claim 1 further including a support substrate bonded to said foraminous layer.
Claim 11
Dependent Claim
17 words
The conductive web of claim 7 wherein said support substrate is characterized as a flexible polymeric foam.
Claim 12
Dependent Claim
16 words
The conductive web of claim 7 wherein said support substrate is characterized as a rigid sheet.
References Cited (Backward Citations)
US2302003A
Cited
US3891786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |