US4658958A
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US
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Transparent article
Assignee: ANDROSCOGGIN SAVINGS BANK
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Filing: 1985-10-30
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Granted: 1987-04-21
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Expires: 2005-10-30
Abstract
Abstract The invention pertains to a laminate having greater optical transparency, while remaining flexible. The laminate is most useful in fabricating envelopes or packages for electronic components featuring EMI and RFI shielding an electrostatic dissipation. The laminate comprises outer layers of an electrostatic free plastic and a middle layer of conductive fibers in a low density mat of between 0.2 and 0.5 ounces per square yard.
Inventors
- 👤 James E. McNulty
- 👤 Robert A. Neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B32B5/00; B32B5/02; B32B5/022; B32B5/024; B32B7/00; B32B7/04; B32B7/12; H; H05; H05K; H05K9/00; H05K9/0067; B32B2307/00; B32B2307/20; B32B2307/21; B32B2307/212; B32B2307/40; B32B2307/412; B32B2439/00; B32B2439/02; Y; Y10; Y10S; Y10S428/00; Y10S428/922
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
63 words
An optically transparent, flexible laminate, comprising: a first transparent, flexible layer of electrostatic free material; a second transparent, flexible layer of electrostatic free material; and a third transparent, flexible layer disposed between said first and second transparent layers comprising a mat of electrically conductive fibers in an approximate weight range of between 0.2 ounces per square yard and 0.5 ounces per square yard.
Claim 2
Dependent Claim
63 words
An optically transparent, flexible laminate, comprising: a first transparent, flexible layer of electrostatic free material; a second transparent, flexible layer of electrostatic free material; and a third transparent, flexible layer disposed between said first and second transparent layers comprising a mat of electrically conductive fibers in an approximate weight range of between 0.2 ounces per square yard and 0.5 ounces per square yard.
Claim 3
Dependent Claim
11 words
An envelope article comprising the optically transparent laminate of claim 1.
Claim 4
Dependent Claim
26 words
The optically transparent, flexible laminate of claim 1, further comprising an adhesive layer disposed between said first and third layer and said second and third layer.
Claim 5
Dependent Claim
33 words
The optically transparent, flexible laminate of claim 1, wherein the fibers of the mat have a length to diameter ratio of approximately at least 0.75 inches in length to 8 microns in diameter.
Claim 6
Dependent Claim
15 words
The optically transparent, flexible laminate of claim 1, wherein the fiber mat comprises woven fibers.
Claim 7
Dependent Claim
14 words
The optically transparent laminate of claim 1, wherein the fiber mat comprises non-woven fibers.
Claim 8
Dependent Claim
15 words
The optically transparent, flexible laminate of claim 1, wherein the fiber mat comprises coated fibers.
Claim 9
Dependent Claim
17 words
The optically transparent, flexible laminate of claim 7, wherein the coated fibers are coated with a metal.
Claim 10
Dependent Claim
13 words
The optically transparent, flexible laminate of claim 8, wherein said metal comprises nickel.
Claim 11
Dependent Claim
15 words
The optically transparent, flexible laminate of claim 1, wherein the fiber mat comprises carbon fibers.
Claim 12
Dependent Claim
17 words
The optically transparent, flexible laminate of claim 10, wherein said carbon fibers are of the polyacrylonitrile type.
Claim 13
Dependent Claim
17 words
The optically transparent, flexible laminate of claim 10, wherein said carbon fibers are of the pitch type.
Claim 14
Dependent Claim
31 words
The optically transparent, flexible laminate of claim 1, wherein said surface resistivity of said first and second electrostatic free layers is aproximately between 10 8 and 10 13 ohms per square.
Claim 15
Dependent Claim
23 words
The optically transparent, flexible laminate of claim 1, wherein the mat of fibers has a resistivity of approximately less than one ohm centimeter.
Claim 16
Dependent Claim
21 words
The optically transparent, flexible laminate of claim 1, wherein said first and second electrostatic free material comprises a low density polyethylene.
Claim 17
Dependent Claim
18 words
The optically transparent, flexible laminate of claim 1, wherein said laminate is manufactured by an extrusion coating process.
Claim 18
Dependent Claim
27 words
The optically transparent, flexible laminate of claim 1, wherein said first and second layers are each comprised of a heat sealable, extrudable, flexible, electrostatic free, polymeric material.
Claim 19
Dependent Claim
19 words
The optically transparent, flexible laminate of claim 17, wherein said polymeric material can comprise a polyolefin or a nylon.
Claim 20
Dependent Claim
16 words
The optically transparent, flexible laminate of claim 17, wherein said polymeric material can contain antistatic agents.
Claim 21
Dependent Claim
17 words
The optically transparent, flexible laminate of claim 19, wherein said antistatic agents can comprise amines or polyglycols.
Claim 22
Dependent Claim
19 words
The optically transparent, flexible laminate of claim 1, wherein said laminate has a transparency of over 50 per cent.
Claim 23
Dependent Claim
35 words
The optically transparent, flexible laminate of claim 1, wherein said mat comprises metal coated fibers, and further wherein the optical transparency of said laminate is approximately in a range between 70 and 80 per cent.
Claim 24
Dependent Claim
20 words
The optically transparent laminate of claim 1, wherein shielding effectiveness at frequencies of 1 to 10 GHz exceeds 25 dB.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |