US4484250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static dissipative mat
Assignee: CONNECTICUT YANKEE COMMUNITY AVENUE
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Filing: 1982-11-05
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Granted: 1984-11-20
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Expires: 2002-11-05
Abstract
Abstract The invention contemplates a washable dust-collecting multi-layer electrically conductive web or mat for safely and quickly discharging personnel-accumulated static electricity. An upper continuous polymeric layer of relatively low conductivity, in the order of 10 8 ohms per square and containing a tackifying resin thoroughly dispersed therein, is bonded to an underlying continuous polymeric layer of much greater conductivity, in the order of 10 2 ohms per square, and provision is made for electrically grounding the underlying layer, illustratively by casting to the intermediate layer a continuous bottom layer of expanded polymeric material of relatively low conductivity.
Inventors
- 👤 Ray M. Rzepecki
- 👤 Victor H. Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:06
CPC Classifications
D; D06; D06N; D06N7/00; D06N7/0005; B; B32; B32B; B32B7/00; B32B7/02; B32B7/025; D06N7/0039; D06N7/0042; H; H05; H05F; H05F3/00; H05F3/02; H05F3/025
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
In a multi-layer conductive web for discharging a static electric charge impressed thereon, wherein an upper layer of thermoplastic polymeric material having a volume resistivity of 1×10 7 to 1×10 12 ohm-cm is in direct physical and electrical connection with a more conductive underlying layer, and wherein conductive means in electrical contact with said underlying layer is provided to connect said underlying layer to ground potential, the improvement wherein said underlying layer is a continuous thin conductive film of thermoplastic polymeric material having a surface resistance in the order of 10 2 ohms per square, and wherein said upper layer significantly includes a tackifying rosin therein to the extent that the upper surface of the upper layer is sufficiently tacky to retain dirt and dust particles and that said rosin will stay thoroughly dispersed in the material of the upper layer, whereby the upper surface of the upper layer is tacky and the surface resistivity of the web as measured on the upper surface of said upper layer is in the order of 10 7 ohms per square.
Claim 2
Dependent Claim
178 words
In a multi-layer conductive web for discharging a static electric charge impressed thereon, wherein an upper layer of thermoplastic polymeric material having a volume resistivity of 1×10 7 to 1×10 12 ohm-cm is in direct physical and electrical connection with a more conductive underlying layer, and wherein conductive means in electrical contact with said underlying layer is provided to connect said underlying layer to ground potential, the improvement wherein said underlying layer is a continuous thin conductive film of thermoplastic polymeric material having a surface resistance in the order of 10 2 ohms per square, and wherein said upper layer significantly includes a tackifying rosin therein to the extent that the upper surface of the upper layer is sufficiently tacky to retain dirt and dust particles and that said rosin will stay thoroughly dispersed in the material of the upper layer, whereby the upper surface of the upper layer is tacky and the surface resistivity of the web as measured on the upper surface of said upper layer is in the order of 10 7 ohms per square.
Claim 3
Dependent Claim
36 words
The improvement of claim 1, in which said conductive means in electrical contact with said underlying layer is a layer of expanded thermoplastic polymeric material having a volume resistivity of 1×10 7 to 1×10 12 ohm-cm.
Claim 4
Dependent Claim
46 words
The improvement of claim 1, in which each of said thermoplastic polymeric materials comprises essentially solid plasticized polyvinyl chloride with a conductive ingredient compounded therein, the conductive ingredient of said upper layer being a salt and the conductive ingredient of said underlying layer being carbon black.
Claim 5
Dependent Claim
38 words
The improvement of claim 3, in which the thickness of said underlying layer is in the range of 1 to 5 mils, and the thickness of said upper layer is in the range of 25 to 50 mils.
Claim 6
Dependent Claim
17 words
The improvement of claim 4, in which the thickness of said underlying layer is substantially 2 mils.
Claim 7
Dependent Claim
20 words
The improvement of claim 5, in which said underlying layer has a surface resistance of substantially 300 ohms per square.
Claim 8
Dependent Claim
37 words
The improvement of claim 3, in which said conductive means comprises a bottom layer of expanded plasticized polyvinyl chloride with a conductive salt compounded therein and having a volume resistivity of 1×10 7 to 1×10 12 ohm-cm.
Claim 9
Dependent Claim
107 words
As an article of manufacture, a multi-layer static-dissipating floor mat, comprising an upper layer of solid electrically conductive plasticized polyvinyl chloride having a volume resistivity of 10 7 to 10 12 ohm-cm, and containing a tackifying rosin thoroughly dispersed therein, said rosin being in the proportion of 25 to 45 percent by weight of initial ingredients of the upper layer, an intermediate layer of thin continuous solid electrically conductive plasticized polyvinyl chloride having a surface resistance in the order of 10 2 ohms per square, and a bottom layer of expanded electrically conductive plasticized polyvinyl chloride having a volume resistivity of 10 7 to 10 12 ohm-cm.
Claim 10
Dependent Claim
107 words
As an article of manufacture, a multi-layer static-dissipating floor mat, comprising an upper layer of solid electrically conductive plasticized polyvinyl chloride having a volume resistivity of 10 7 to 10 12 ohm-cm, and containing a tackifying rosin thoroughly dispersed therein, said rosin being in the proportion of 25 to 45 percent by weight of initial ingredients of the upper layer, an intermediate layer of thin continuous solid electrically conductive plasticized polyvinyl chloride having a surface resistance in the order of 10 2 ohms per square, and a bottom layer of expanded electrically conductive plasticized polyvinyl chloride having a volume resistivity of 10 7 to 10 12 ohm-cm.
Claim 11
Dependent Claim
17 words
The article of claim 8, in which said tackifier is a pentaerythrital ester of a tall-oil rosin.
Claim 12
Dependent Claim
22 words
The article of claim 9, in which said rosin constitutes approximately one-third of the weight of initial ingredients of the upper layer.
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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |