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Patent US4491894A successfully refreshed from Google Patents.
US4491894A
Expired / Lapsed
US
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Antistatic floormats
Assignee: Dennison Manufacturing Co
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Filing: 1983-07-27
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Granted: 1985-01-01
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Expires: 2003-07-27
Abstract
Abstract Antistatic floormats having superior mechanical properties and charge dissipating characteristics. The floormats consist of flexible laminations of a semiconductive material, which resist fracture due to local stresses. The laminations include one or more conductive edge clips or other ion collectors in order to provide efficient charge dissipation paths. A preferred design includes a base construction configured to provide structural support with reduced stress concentrations. An alternative base construction incorporates an array of edge supports with an unbroken central area. The floormats are generally characterized by a transparent or translucent appearance, optionally overlaid with a decorative pattern of semiconductive resin having anti-skid characteristics.
Inventors
- 👤 Warren R. Pitts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:07
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/02; H05F3/025
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
57 words
A charge dissipating mat, comprising: a plurality of transparent thermoplastic layers, each layer containing an antistatic agent, forming a lamination with first and second faces; at least one electrically conductive ion collector member; and an electrically conductive medium on at least one of the first and second faces of said mat, connected with said ion collector member.
Claim 2
Dependent Claim
57 words
A charge dissipating mat, comprising: a plurality of transparent thermoplastic layers, each layer containing an antistatic agent, forming a lamination with first and second faces; at least one electrically conductive ion collector member; and an electrically conductive medium on at least one of the first and second faces of said mat, connected with said ion collector member.
Claim 3
Dependent Claim
27 words
A charge dissipating mat as defined in claim 1, wherein said ion collector member comprises an edge clip bridging the upper and lower faces of said mat.
Claim 4
Dependent Claim
28 words
A charge dissipating mat as defined in claim 1, wherein the thermoplastic layers include a binder material selected from the group polyvinyl chloride, polypropylene, polycarbonates, and acrylic polymers.
Claim 5
Dependent Claim
20 words
A charge dissipating mat as defined in claim 3 wherein the transparent thermoplastic layers are further comprised of a plasticizer.
Claim 6
Dependent Claim
22 words
A charge dissipating mat as defined in claim 1 wherein the ion collector member is electrically grounded through a current limiting resistor.
Claim 7
Dependent Claim
29 words
A charge dissipating mat as defined in claim 1 wherein the second face of said mat is configured with a plurality of support members, characterized by smooth surface curvature.
Claim 8
Dependent Claim
18 words
A charge dissipating mat as defined in claim 1 wherein said conductive medium comprises a printed semiconductive pattern.
Claim 9
Dependent Claim
27 words
A charge dissipating mat as defined in claim 7 wherein the semiconductive pattern is comprised of a thin layer of thermoplastic resin containing dispersed carbon black powder.
Claim 10
Dependent Claim
20 words
A charge dissipating mat as defined in claim 1 wherein the conductive medium comprises a matrix of elongate metallic members.
Claim 11
Dependent Claim
35 words
A charge dissipating mat, comprising a plurality of transparent thermoplastic layers, forming a lamination with first and second faces; and an opaque pattern layer laminated to at least one of said first and second faces.
Claim 12
Dependent Claim
35 words
A charge dissipating mat, comprising a plurality of transparent thermoplastic layers, forming a lamination with first and second faces; and an opaque pattern layer laminated to at least one of said first and second faces.
Claim 13
Dependent Claim
23 words
A charge dissipating mat as defined in claim 10 wherein the opaque pattern layer is comprised of an electrically conductive or semiconductive material.
Claim 14
Dependent Claim
21 words
A charge dissipating mat as defined in claim 11 further comprising an electrically conductive member connected with said opaque pattern layer.
Claim 15
Dependent Claim
36 words
A charge-dissipating mat, comprising a plurality of transparent thermoplastic layers, forming a lamination with first and second faces; and first and second opaque pattern layers respectively laminated to said first and second faces, in symmetric registration.
Claim 16
Dependent Claim
36 words
A charge-dissipating mat, comprising a plurality of transparent thermoplastic layers, forming a lamination with first and second faces; and first and second opaque pattern layers respectively laminated to said first and second faces, in symmetric registration.
Claim 17
Dependent Claim
22 words
A charge-dissipating mat as defined in claim 13, wherein the opaque pattern layers are characterized by a relatively high coefficient of friction.
Claim 18
Dependent Claim
26 words
A charge dissipating mat as defined in claim 10 wherein the opaque pattern layer is comprised of a thermoplastic binder resin with dispersed carbon black powder.
Claim 19
Dependent Claim
47 words
A charge-dissipating mat, comprising a plurality of transparent thermoplastic layers, forming a lamination with first and second faces, wherein said first face is configured in a protruding lattice structure with recessed interstices; and an opaque pattern layer in registration with and laminated to said protruding lattice structure.
Claim 20
Dependent Claim
47 words
A charge-dissipating mat, comprising a plurality of transparent thermoplastic layers, forming a lamination with first and second faces, wherein said first face is configured in a protruding lattice structure with recessed interstices; and an opaque pattern layer in registration with and laminated to said protruding lattice structure.
Claim 21
Dependent Claim
21 words
A charge dissipating mat as defined in claim 16 wherein the protruding lattice structure includes an array of stress relief cavities.
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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) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |