Patent US3634726A successfully refreshed from Google Patents.
US3634726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device to remove static electricity from plastic films
Assignee: Progil SARL
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Filing: 1970-05-27
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Granted: 1972-01-11
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Expires: 1990-05-27
Abstract
Abstract Process and apparatus to remove static electricity from the surfaces of thermoplastic films, sheets and fabrics comprising creating, near the thermoplastic support to be treated, a silent electrical discharge by means of an enamelled wire maintained under a high voltage disposed parallel to said support and above which are provided earth-connected conductive pieces.
Inventors
- 👤 Pierre Jay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:13
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/04; H01; H01T; H01T19/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
An apparatus for removing static electricity from the surface of a thermoplastic material selected from the group consisting of films, sheets and fabrics, comprising means for continuously feeding said thermoplastic material along a generally planar path; a treatment zone adjacent the path of travel of said thermoplastic material comprising means for discharging static electricity including an enamelled conductive wire spaced about 1 to 10 mm. from and parallel to the plane of said path of said material, means for maintaining a high AC voltage of about 2, 000 to 8,000 volts at a frequency between about 300 to 2,000 Hertz on said wire, and a conductive proximity ground spaced adjacent said wire.
Claim 2
Dependent Claim
25 words
An apparatus according to claim 2 in which said wire, constituted of a metal or metal alloy, has a diameter between 0.0l and 1 mm.
Claim 3
Dependent Claim
34 words
An apparatus according to claim 2 in which said proximity grounds are placed above said enamelled wire at a distance approximately equal to the distance between the wire and the surface to be treated.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |