US4156751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet material for forming envelopes used to protect electronic components
Assignee: 3M Co
•
Filing: 1977-04-08
•
Granted: 1979-05-29
•
Expires: 1997-04-08
Abstract
Abstract A flexible sheet material for forming an envelope used to enclose and protect electronic components from electrostatic charges during storage and shipment. The sheet material is sufficiently transparent to afford visual identification of an electronic component through the envelope, while including a polymeric sheet having a high volume resistivity to electrically isolate a component within the envelope, an antistatic material which is disposed at an inner surface of the envelope for dissipating and restricting electrostatic charges on components within the envelope, and a highly conductive layer which is then disposed on the outer surface of the polymeric sheet and provides a highly conductive outer surface on the envelope for grounding electrostatic charges brought into contact with the envelope.
Inventors
- 👤 Donald M. Yenni, Jr.
- 👤 Steven W. Knutsen
- 👤 Edward J. Downing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:53
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; H; H10; H10W; H10W74/00; H10W74/40; H10W74/47; H10W74/473; B32B15/00; B32B15/04; B32B15/08; B32B15/09; B32B27/32; B32B27/36; H05; H05F; H05F1/00; H05F1/02; H10W42/00; H10W42/60; B32B2307/00; B32B2307/20; B32B2307/21; B32B2307/30; B32B2307/31; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/554; B32B2311/00; B32B2311/22; B32B2323/00; B32B2323/04; B32B2323/046; B32B2327/00; B32B2327/06; B32B2331/00; B32B2331/04; B32B2367/00; B32B2369/00; B32B2439/00; Y; Y10; Y10S; Y10S428/00; Y10S428/918; Y10S428/922; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/31; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
131 words
A flexible sheet material having first and second major surfaces adapted for forming an envelope with said second surface defining the inner surface of the envelope, which envelope can receive and electrically protect an electronic component, said sheet material comprising a self-supporting electrically insulating polymeric sheet having a volume resistivity of at least about 10 10 ohm-centimeters, an organic antistatic material providing a surface resistivity on said second surface in the range of 10 8 to 10 14 ohms per square, and a conductive layer on the surface of said polymeric sheet opposite said second surface providing a surface resistivity on said first surface of no greater than 10 4 ohms per square, said sheet material being sufficiently transparent to afford visual identification of an electrical component through the sheet material.
Claim 2
Dependent Claim
131 words
A flexible sheet material having first and second major surfaces adapted for forming an envelope with said second surface defining the inner surface of the envelope, which envelope can receive and electrically protect an electronic component, said sheet material comprising a self-supporting electrically insulating polymeric sheet having a volume resistivity of at least about 10 10 ohm-centimeters, an organic antistatic material providing a surface resistivity on said second surface in the range of 10 8 to 10 14 ohms per square, and a conductive layer on the surface of said polymeric sheet opposite said second surface providing a surface resistivity on said first surface of no greater than 10 4 ohms per square, said sheet material being sufficiently transparent to afford visual identification of an electrical component through the sheet material.
Claim 3
Dependent Claim
17 words
A sheet material according to claim 1, wherein said polymeric sheet comprises a thermoplastic heat sealable material.
Claim 4
Dependent Claim
30 words
A sheet material according to claim 1, wherein said polymeric sheet consists only of a thermoplastic heat sealable material and wherein said antistatic material is throughout said heat sealable material.
Claim 5
Dependent Claim
61 words
A sheet material according to claim 1, wherein said polymeric sheet comprises a layer of polyester in contact with said conductive layer and a layer of thermoplastic heat sealable material defining said second surface and disposed on the surface of said layer of polyester opposite said conductive layer, and wherein said antistatic material is throughout said layer of heat sealable material.
Claim 6
Dependent Claim
39 words
A sheet material according to claim 4, wherein said conductive layer is of metal and said material further comprises an ultrathin abrasion resistant layer of a resinous material over the surface of said conductive layer opposite said second surface.
Claim 7
Dependent Claim
12 words
A sheet material according to claim 5, wherein said metal is nickel.
Claim 8
Dependent Claim
73 words
A sheet material according to claim 1, wherein said polymeric sheet comprises a layer of polyester in contact with said conductive layer and a layer of thermoplastic heat sealable material disposed on the side of said layer of polyester opposite said conductive layer, and wherein said antistatic material is in a layer defining said second surface and disposed on the surface of said layer of heat sealable material opposite said layer of polyester.
Claim 9
Dependent Claim
39 words
A sheet material according to claim 7, wherein said conductive layer is of metal and said material further comprises an ultrathin abrasion resistant layer of a resinous material over the surface of said conductive material opposite said second surface.
Claim 10
Dependent Claim
12 words
A sheet material according to claim 8, wherein said metal is nickel.
Claim 11
Dependent Claim
25 words
A sheet material according to claim 1, wherein said sheet material has a light transmission of at least 60% between said first and second surfaces.
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) | 1982-05-28 | 1982-11-27 | 1983-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-28 | 1986-11-27 | 1987-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-28 | 1990-11-27 | 1991-05-29 | $7700.00 | Window Closed / Lapsed |