US4534918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the electrostatic pinning of polymeric webs
Assignee: EIDP Inc
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Filing: 1983-10-27
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Granted: 1985-08-13
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Expires: 2003-10-27
Abstract
Abstract A method and apparatus for enhancing the electrostatic pinning force on a freshly cast, polymeric web by generating primary and secondary electric fields and localizing the flow of current in the secondary field at spaced points through the width of the web. This is achieved by providing conductive pins projecting from a secondary electrode toward a primary electrode.
Inventors
- 👤 Albert W. Forrest, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:59
CPC Classifications
H; H01; H01T; H01T19/00; H01T19/04; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/915; B29C48/9165
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
In a pinning apparatus including a moving conductive grounded support for a polymeric web, an elongated charged electrode extending transversely of the support and a grounded electrode parallel therewith, the improvement comprising provision of conductive pins projecting from said grounded electrode, said pins having points located adjacent the charged electrode whereby to stabilize the flow of current between said electrodes.
Claim 2
Dependent Claim
60 words
In a pinning apparatus including a moving conductive grounded support for a polymeric web, an elongated charged electrode extending transversely of the support and a grounded electrode parallel therewith, the improvement comprising provision of conductive pins projecting from said grounded electrode, said pins having points located adjacent the charged electrode whereby to stabilize the flow of current between said electrodes.
Claim 3
Dependent Claim
55 words
An ion discharge device for pinning a freshly cast, polymeric web to a grounded quenching drum, said device comprising first and second electrodes, the first electrode being a charged, fine wire, the second electrode being a grounded bar having a plurality of spaced, conductive pins mounted thereon, said pins having points located adjacent said wire.
Claim 4
Dependent Claim
55 words
An ion discharge device for pinning a freshly cast, polymeric web to a grounded quenching drum, said device comprising first and second electrodes, the first electrode being a charged, fine wire, the second electrode being a grounded bar having a plurality of spaced, conductive pins mounted thereon, said pins having points located adjacent said wire.
Claim 5
Dependent Claim
14 words
The device of claim 2 wherein the points are located equidistant from the wire.
Claim 6
Dependent Claim
32 words
The device of claim 3 wherein the bar has apertures therethrough for the pins and is provided with means permitting adjustment of the pins with respect to the bar and the wire.
Claim 7
Dependent Claim
10 words
The device of claim 4 wherein the pins are equispaced.
Claim 8
Dependent Claim
58 words
In a method including the steps of advancing a freshly cast polymeric web to a moving support and establishing electric fields between first and second electrodes as well as between the first electrode and the support, the improvment comprising the step of localizing the flow of current between the two electrodes at spaced points along the length thereof.
Claim 9
Dependent Claim
58 words
In a method including the steps of advancing a freshly cast polymeric web to a moving support and establishing electric fields between first and second electrodes as well as between the first electrode and the support, the improvment comprising the step of localizing the flow of current between the two electrodes at spaced points along the length thereof.
Claim 10
Independent Claim
44 words
A method of establishing an enhanced, pinning force on a freshly cast, polymeric web comprising the steps of generating primary and secondary, electric fields extending through the width of the web and localizing the flow of current in said secondary field at spaced points.
Claim 11
Independent Claim
44 words
A method of establishing an enhanced, pinning force on a freshly cast, polymeric web comprising the steps of generating primary and secondary, electric fields extending through the width of the web and localizing the flow of current in said secondary field at spaced points.
References Cited (Backward Citations)
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GB1100414A
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USRE27771E
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DE2358989A1
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JPS5141763A
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JPS5434370A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |