US4529087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed antistatic plastic bag
Assignee: NEAL ROBERT C/O MAINE POLY Inc PO BOX 8 ROUTE 202 GREENE MAINE 04236
•
Filing: 1983-10-21
•
Granted: 1985-07-16
•
Expires: 2003-10-21
Abstract
Abstract An antistatic sheet or bag for electrostatic sensitive devices is obtained by uniformly mixing a thermoplastic polymer such as polyethylene with about 0.1 to 0.7 per cent by weight of an antistat, extruding the mixture in the form of a tubular sheet, subjecting the sheet to a corona discharge, printing on the sheet or both sides of a tube forming said sheet, with a carbon conducting ink, cutting the sheet into units of desired length and sealing the end of each such cut unit to form a bag.
Inventors
- 👤 Robert Neal
- 👤 Robert Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:12
CPC Classifications
B; B65; B65D; B65D31/00; B65D65/00; B65D65/38; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
96 words
An antistatic sheet for the rapid dissipation of an electrostatic charge, said sheet comprised of a thermoplastic polymer selected from the group consisting of polyethylene, polypropolyene and copolymers of ethylene and propylene, said polymer having uniformly distributed therein from about 0.1 to about 0.7 percent by weight of an antistat selected from the group consisting a tertiary amine, an anionic phosphate ester a quaternary ammonium halide, and a sulfonated aliphatic hydrocarbon, said sheet having been subjected to a corona discharge and having an imprint of carbon conducting ink thereon adapted to rapidly dissipate an electrostatic charge.
Claim 2
Dependent Claim
96 words
An antistatic sheet for the rapid dissipation of an electrostatic charge, said sheet comprised of a thermoplastic polymer selected from the group consisting of polyethylene, polypropolyene and copolymers of ethylene and propylene, said polymer having uniformly distributed therein from about 0.1 to about 0.7 percent by weight of an antistat selected from the group consisting a tertiary amine, an anionic phosphate ester a quaternary ammonium halide, and a sulfonated aliphatic hydrocarbon, said sheet having been subjected to a corona discharge and having an imprint of carbon conducting ink thereon adapted to rapidly dissipate an electrostatic charge.
Claim 3
Dependent Claim
10 words
A sheet according to claim 1 formed into a tube.
Claim 4
Dependent Claim
16 words
A tube according to claim 2 formed into a bag closed at least at one end.
Claim 5
Dependent Claim
16 words
The invention according to claim 1 wherein said imprint thereon is in the form a grid.
Claim 6
Dependent Claim
16 words
The invention according to claim 2 wherein said imprint thereon is in the form a grid.
Claim 7
Dependent Claim
14 words
The invention according to claim 1 wherein said imprint thereon is substantially without gaps.
Claim 8
Dependent Claim
14 words
The invention according to claim 2 wherein said imprint thereon is substantially without gaps.
Claim 9
Dependent Claim
22 words
The invention according to claim 5 or 7 wherein said imprint thereon is a grid in the form of a Faraday cage.
Claim 10
Dependent Claim
13 words
The invention according to claims 1 or 2 wherein the polymer is polyethylene.
Claim 11
Dependent Claim
13 words
The invention according to claim 9 wherein the antistat is a tertiary amine.
Claim 12
Dependent Claim
13 words
The invention according to claim 10 wherein the tertiary amine is a bis-(hydroxyethyl)-alkylamine.
Claim 13
Dependent Claim
21 words
The invention according to claim 10 wherein the tertiary amine is present in an amount of about 0.5 percent by weight.
Claim 14
Dependent Claim
32 words
The invention according to claims 4 or 5 wherein the grid is comprised of about 20 to about 40 horizontal lines and about 20 to about 40 vertial lines per linear inch.
Claim 15
Dependent Claim
23 words
The invention according to claims 4 or 5 wherein the grid is comprised of 25 horizontal and 25 vertical lines per linear inch.
References Cited (Backward Citations)
US3223554A
Cited
US3801418A
Cited
US4154344A
Cited
US4211324A
Cited
US4336093A
Cited
US4267927A
Cited
US4424900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |