US4100396A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for electrically perforating moving webs
Assignee: Magnera Corp
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Filing: 1977-02-14
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Granted: 1978-07-11
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Expires: 1997-02-14
Abstract
Abstract Apparatus and method for electrically perforating a moving web such as paper, film and the like by passing the web between at least one electrically charged electrode and a ground electrode in a perforating unit, the charged electrode comprising a member adapted to rotate in a direction parallel to the direction of the moving web and connected to an intermittent high voltage source and the ground electrode comprising means adapted to move in a direction at right angles to the direction of rotation of the charged electrode.
Inventors
- 👤 Richard Hugo Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:56
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/26; B26F1/28; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0405; Y10T83/041; Y10T83/0414
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
A method for perforating paper by electrical discharge comprising passing the paper between spaced discharge and ground electrodes having opposed surfaces moving at right angles toward one another, said discharge electrodes comprising a plurality of equal diameter rotating discs aligned axially in spaced relationship to one another, said ground electrode comprising a narrow endless member moving parallel to the axis of said discs and spaced from the peripheral edges of said discs, and perforating said paper by intermittently discharging an electric current between the edges of each of said discs and said member through the paper.
Claim 2
Independent Claim
96 words
A method for perforating paper by electrical discharge comprising passing the paper between spaced discharge and ground electrodes having opposed surfaces moving at right angles toward one another, said discharge electrodes comprising a plurality of equal diameter rotating discs aligned axially in spaced relationship to one another, said ground electrode comprising a narrow endless member moving parallel to the axis of said discs and spaced from the peripheral edges of said discs, and perforating said paper by intermittently discharging an electric current between the edges of each of said discs and said member through the paper.
Claim 3
Dependent Claim
14 words
The method of claim 1 in which the ground electrode is a narrow band.
Claim 4
Dependent Claim
13 words
The method of claim 1 in which the ground electrode is a wire.
Claim 5
Dependent Claim
19 words
The method of claim 1 in which the opposed surfaces of said discharge and ground electrodes have sharp edges.
Claim 6
Independent Claim
55 words
A method for perforating dielectric web material by electrical discharge comprising passing the web material between spaced discharge and ground electrodes having opposed surfaces moving at right angles to one another, said ground electrode comprising a narrow band, and perforating said material by discharging an electric current intermittently between said electrodes and through said material.
Claim 7
Independent Claim
55 words
A method for perforating dielectric web material by electrical discharge comprising passing the web material between spaced discharge and ground electrodes having opposed surfaces moving at right angles to one another, said ground electrode comprising a narrow band, and perforating said material by discharging an electric current intermittently between said electrodes and through said material.
Claim 8
Dependent Claim
17 words
The method of claim 5 in which the discharge electrode is a disc rotating on its axis.
Claim 9
Dependent Claim
13 words
The method of claim 5 in which the ground electrode is a ribbon.
Claim 10
Dependent Claim
16 words
The method of claim 5 in which the opposed surfaces of said electrodes have knife-like edges.
Claim 11
Dependent Claim
54 words
A mathod for perforating dielectric web material by electrical discharge comprising passing the web material between spaced discharge and ground electrodes having opposed surfaces moving at right angles to one another, said ground electrode comprising a wire, and perforating said material by discharging an electric current intermittently between said electrodes and through said material.
Claim 12
Dependent Claim
54 words
A mathod for perforating dielectric web material by electrical discharge comprising passing the web material between spaced discharge and ground electrodes having opposed surfaces moving at right angles to one another, said ground electrode comprising a wire, and perforating said material by discharging an electric current intermittently between said electrodes and through said material.
Claim 13
Dependent Claim
17 words
The method of claim 9 in which the discharge electrode is a disc rotating on its axis.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |