Patent US923182A successfully refreshed from Google Patents.
Patent US3790854A successfully refreshed from Google Patents.
US3790854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for removing static charge from webs of material
Assignee: Kalle GmbH and Co KG
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Filing: 1971-09-07
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Granted: 1974-02-05
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Expires: 1991-09-07
Abstract
Abstract This invention relates to a method and apparatus for discharging a statically charged web of material. The method comprises bombarding the web with charge carriers produced by a highfrequency A.C. voltage of 1 to 1,000 kilocycles per second and having a current intensity of between a few Mu amp./cm of web width and several hundred Mu amp./cm of web width.
Inventors
- 👤 K Dryczynski
- 👤 H Kramer
- 👤 D Messner
- 👤 W Seifried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:47
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/04
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
53 words
A method of discharging a statically charged web of material which comprises bombarding the web with charge carriers produced by a high-frequency alternating current of 5 to 50 kilocycles per second and having a current intensity of between a few Mu amp./cm of web width and several hundred Mu amp./cm of web width.
Claim 2
Independent Claim
53 words
A method of discharging a statically charged web of material which comprises bombarding the web with charge carriers produced by a high-frequency alternating current of 5 to 50 kilocycles per second and having a current intensity of between a few Mu amp./cm of web width and several hundred Mu amp./cm of web width.
Claim 3
Independent Claim
67 words
An apparatus for discharging a statically charged web of material which comprises at least one uncoated wire means having a thickness less than 100 Mu and being adapted to extend over the width of the web, means for supplying high-frequency alternating current of 5 to 50 kilocycles per second to said wire means, and counter-electrode means on the same side of the web as said wirE means.
Claim 4
Independent Claim
67 words
An apparatus for discharging a statically charged web of material which comprises at least one uncoated wire means having a thickness less than 100 Mu and being adapted to extend over the width of the web, means for supplying high-frequency alternating current of 5 to 50 kilocycles per second to said wire means, and counter-electrode means on the same side of the web as said wirE means.
Claim 5
Dependent Claim
32 words
A method as claimed in claim 1, wherein the bombardment is carried out with charge carriers which are produced with a current intensity of 10 to 100 Mu amp./cm of web width.
Claim 6
Dependent Claim
24 words
A method as claimed in claim 1, wherein the bombardment is carried out with charge carriers which are produced in a readily ionizable gas.
Claim 7
Dependent Claim
18 words
An apparatus as claimed in claim 2, in which the wire thickness is 5 to 50 Mu .
Claim 8
Dependent Claim
18 words
An apparatus as claimed in claim 2, in which a plurality of wires are arranged alongside one another.
Claim 9
Dependent Claim
17 words
An apparatus as claimed in claim 2, in which the wire means is arranged in zig-zag form.
Claim 10
Dependent Claim
18 words
An apparatus as claimed in claim 2, in which the wire means are mounted in insulating support elements.
Claim 11
Dependent Claim
17 words
An apparatus as claimed in claim 2, in which the wire means are fitted within protective elements.
Claim 12
Dependent Claim
29 words
An apparatus as claimed in claim 9, in which a protective element for the wire means is a plate containing channels corresponding in number to the number of wires.
Claim 13
Dependent Claim
13 words
An apparatus as claimed in claim 10, in which the channels are rectangular.
Claim 14
Dependent Claim
13 words
An apparatus as claimed in claim 10, in which the channels are semi-circular.
Claim 15
Dependent Claim
39 words
An apparatus as claimed in claim 10, in which the distance of the wire means from the side walls of the channels is 6 to 8 mm, and from the floor of the channels is 15 to 20 mm..
Claim 16
Dependent Claim
45 words
An apparatus as claimed in claim 12, in which the distance of the wire means from the portion of the channel constituting the floor thereof is up to 25 percent less than their distance from the portions of the channel constituting the side walls thereof.
Claim 17
Dependent Claim
20 words
An apparatus as claimed in claim 2, in which a dielectric is located between the wire means and the counter-electrode.
Claim 18
Dependent Claim
25 words
An apparatus as claimed in claim 2, in which a relatively wide-mesh protective grid is fitted between the web of material and the wire means.
Claim 19
Dependent Claim
22 words
An apparatus as claimed in claim 16, in which for controlling the discharge characteristic the protective grid is connected to the counter-electrode.
Claim 20
Dependent Claim
19 words
An apparatus as claimed in claim 2, in which the wire means has tensioning means at the ends thereof.
Claim 21
Dependent Claim
14 words
An apparatus as claimed in claim 18, in which the tensioning means are springs.
Claim 22
Dependent Claim
27 words
An apparatus as claimed in claim 2, in which means are additionally provided for heating the gas zone between the web of material and the wire means.
Claim 23
Dependent Claim
55 words
An apparatus as claimed in claim 2, so adapted that in the case of a generated current intensity of 10 Mu amp. to 100 Mu amp./cm of web width, the distance of the wire means from the path of the web from which the static charge is to be removed is 15 to 25 mm.
Claim 24
Dependent Claim
24 words
An apparatus as claimed in claim 2, in which a plurality of wires are arranged in different planes and are offset from one another.
Claim 25
Dependent Claim
47 words
An apparatus as claimed in claim 2, in which the wire means are fitted inside at least one pair of rotatable rolls containing openings, the arrangement being such that the web from which the charge is to be removed can be passed over the rolls in succession.
Claim 26
Dependent Claim
20 words
An apparatus as claimed in claim 23, in which the wire means are distributed over the circumference of the rolls.
Claim 27
Dependent Claim
23 words
An apparatus as claimed in claim 23, in which the wire means are so held that they do not rotate with the roll.
Claim 28
Dependent Claim
16 words
An apparatus as claimed in claim 23, in which the rolls are made of thin wires.
Claim 29
Dependent Claim
18 words
An apparatus as claimed in claim 23, in which a further discharge apparatus is fitted opposite the rolls.
Claim 30
Dependent Claim
17 words
An apparatus as claimed in claim 27, in which the further discharge apparatus is of curved form.
Claim 31
Dependent Claim
23 words
An apparatus as claimed in claim 28, in which the further discharge apparatus has a curvature corresponding to the radius of the rolls.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |