US4301040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive foam and method of preparation and use
Assignee: Charleswater Products Inc
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Filing: 1980-06-19
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Granted: 1981-11-17
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Expires: 2000-06-19
Abstract
Abstract A static-free, polymeric surface mat to prevent the accumulation of static charge, particularly in the packaging and handling of electronic components and devices, which mat comprises a nonconductive, synthetic-material layer with a top surface, optionally an adhesive layer on the bottom surface of the synthetic material, and a solid or foam layer of a conductive material, such as an open-cell urethane foam impregnated with finely-divided conductive particles, and a film-forming binder material to secure the particles uniformly onto the foam.
Inventors
- 👤 George R. Berbeco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:52
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/04; B32B7/12; H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; B32B27/00; B32B27/06; B32B27/065; B32B5/00; B32B5/16; B32B5/18; H01B3/00; H01B3/002; H01B3/004; H05; H05F; H05F3/00; H05F3/02; H05F3/025; H05K; H05K9/00; H05K9/0073; H05K9/0079; H10; H10W; H10W20/00; H10W20/40; H10W42/00; H10W42/60; H10W72/00; B32B2264/00; B32B2264/10; B32B2264/107; B32B2264/108; B32B2266/00; B32B2266/06; B32B2307/00; B32B2307/20; B32B2307/206; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/16; Y10S260/21; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
A static-dissipating, synthetic, surface-covering sheet material which comprises: (a) an electrically nonconducting, synthetic sheet laminate material having a hard thermoset resin top surface suitable for use as a surface covering; and (b) an electrically conductive layer of a polymeric, film-forming, particulate binder material secured to the bottom surface of the synthetic sheet material, the polymeric material containing uniformly dispersed therein a static-reducing amount of electrically conductive particulate material wherein the particulate material comprises from about 2 to 40% by weight of the polymeric binder material, whereby static charges, accumulating on the top surface of the synthetic sheet material, are dissipated through the electrically conductive layer.
Claim 2
Dependent Claim
105 words
A static-dissipating, synthetic, surface-covering sheet material which comprises: (a) an electrically nonconducting, synthetic sheet laminate material having a hard thermoset resin top surface suitable for use as a surface covering; and (b) an electrically conductive layer of a polymeric, film-forming, particulate binder material secured to the bottom surface of the synthetic sheet material, the polymeric material containing uniformly dispersed therein a static-reducing amount of electrically conductive particulate material wherein the particulate material comprises from about 2 to 40% by weight of the polymeric binder material, whereby static charges, accumulating on the top surface of the synthetic sheet material, are dissipated through the electrically conductive layer.
Claim 3
Dependent Claim
25 words
The article of claim 1 which includes an adhesive layer to adhere the bottom surface of the synthetic sheet material to the electrically conductive layer.
Claim 4
Dependent Claim
29 words
The article of claim 1 wherein the electrically conductive layer comprises a thin solid coating of the polymeric binder material to the bottom surface of the synthetic sheet material.
Claim 5
Dependent Claim
36 words
The article of claim 1 wherein the electrically conductive layer comprises a polymeric foam layer uniformly impregnated with the electrically conductive particles, with the polymeric binder material securing the conductive particulate material to the polymeric foam.
Claim 6
Dependent Claim
16 words
The article of claim 4 wherein the polymeric foam comprises an open-cell, flexible, urethane foam material.
Claim 7
Dependent Claim
14 words
The article of claim 1 wherein the polymeric binder material comprises a styrene-butadiene polymer.
Claim 8
Dependent Claim
31 words
The article of claim 1 wherein the particulate material has a particle size of less than about 40 millimicrons and a nitrogen surface area of 100 to 1200 m 2 /gram.
Claim 9
Dependent Claim
12 words
The article of claim 1 wherein the particulate material comprises carbon-black particles.
Claim 10
Dependent Claim
28 words
The article of claim 1 wherein the surface resistance of the electrically conductive layer is characterized by a surface resistance of less than 5,000 ohms per square inch.
Claim 11
Dependent Claim
30 words
The article of claim 1 wherein the synthetic sheet material comprises a flexible synthetic material selected from the group consisting of nitrile rubber, butyl rubber, SBR, polyolefin and vinyl-chloride resins.
Claim 12
Dependent Claim
13 words
The article of claim 1 wherein the resin is a melamine-formaldehyde resin surface.
Claim 13
Dependent Claim
185 words
A static-dissipating, synthetic, surface-covering sheet material which comprises: (a) a flat, electrically nonconducting, synthetic sheet material having a washable top surface suitable for use as a surface covering; (b) an adhesive layer securing the bottom surface of the synthetic sheet material to the electrically conductive layer; and (c) a thin, electrically conductive layer of a polymeric, film-forming, particulate binder material, the conductive layer comprising an open-cell, polymeric urethane foam material, the polymeric foam layer uniformly impregnated with the electrically conductive particles, the binder material secured to the bottom surface of the synthetic sheet material by the adhesive layer, the polymeric material securing the conductive particles to the polymeric foam and containing uniformly dispersed therein a static-reducing amount of electrically conductive particulate material having a particle size of less than about 40 millimicrons and a nitrogen surface area of 100 to 1200 m 2 /gram, the surface resistance of the electrically conductive layer characterized by a surface resistance of less than 5,000 ohms per square inch, whereby static charges, accumulating on the top surface of the synthetic sheet material, are dissipated through the electrically conductive layer.
Claim 14
Dependent Claim
185 words
A static-dissipating, synthetic, surface-covering sheet material which comprises: (a) a flat, electrically nonconducting, synthetic sheet material having a washable top surface suitable for use as a surface covering; (b) an adhesive layer securing the bottom surface of the synthetic sheet material to the electrically conductive layer; and (c) a thin, electrically conductive layer of a polymeric, film-forming, particulate binder material, the conductive layer comprising an open-cell, polymeric urethane foam material, the polymeric foam layer uniformly impregnated with the electrically conductive particles, the binder material secured to the bottom surface of the synthetic sheet material by the adhesive layer, the polymeric material securing the conductive particles to the polymeric foam and containing uniformly dispersed therein a static-reducing amount of electrically conductive particulate material having a particle size of less than about 40 millimicrons and a nitrogen surface area of 100 to 1200 m 2 /gram, the surface resistance of the electrically conductive layer characterized by a surface resistance of less than 5,000 ohms per square inch, whereby static charges, accumulating on the top surface of the synthetic sheet material, are dissipated through the electrically conductive layer.
Claim 15
Dependent Claim
150 words
A static-dissipating, synthetic, surface-covering sheet material which comprises: (a) an electrically nonconducting, synthetic, sheet laminate material having a hard, smooth, thermoset-resin top surface and a top surface suitable for use as a surface covering; (b) an adhesive layer securing the bottom surface of the synthetic sheet meterial to the electrically conductive layer; and (c) a thin, electrically conductive, solid coating layer of a polymeric, film-forming, particulate binder material comprising a styrene-butadiene polymer, the polymeric binder material secured to the bottom surface of the synthetic sheet material by the adhesive layer, the polymeric material containing uniformly dispersed therein a static-reducing amount of electrically conductive particulate material comprising carbon-black particles having a particle size of less than about 40 millimicrons and a nitrogen surface area of 100 to 1200 m 2 /gram, whereby static charges, accumulating on the top surface of the synthetic sheet material, are dissipated through the electrically conductive layer.
Claim 16
Dependent Claim
150 words
A static-dissipating, synthetic, surface-covering sheet material which comprises: (a) an electrically nonconducting, synthetic, sheet laminate material having a hard, smooth, thermoset-resin top surface and a top surface suitable for use as a surface covering; (b) an adhesive layer securing the bottom surface of the synthetic sheet meterial to the electrically conductive layer; and (c) a thin, electrically conductive, solid coating layer of a polymeric, film-forming, particulate binder material comprising a styrene-butadiene polymer, the polymeric binder material secured to the bottom surface of the synthetic sheet material by the adhesive layer, the polymeric material containing uniformly dispersed therein a static-reducing amount of electrically conductive particulate material comprising carbon-black particles having a particle size of less than about 40 millimicrons and a nitrogen surface area of 100 to 1200 m 2 /gram, whereby static charges, accumulating on the top surface of the synthetic sheet material, are dissipated through the electrically conductive 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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |