US3758251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic pinning of polymeric film
Assignee: EIDP Inc
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Filing: 1971-12-02
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Granted: 1973-09-11
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Expires: 1991-12-02
Abstract
Abstract An apparatus for electrostatic edge pinning of thermoplastic film to a quench surface comprising a pinning wire positioned substantially parallel to the quenching surface and over each edge of the polymeric film.
Inventors
- 👤 E Gillyns
- 👤 N Thill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:37
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/915; B29C48/9165; B29C48/03; B29C48/07; B29C48/08; B29C48/914
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
In an apparatus for pinning a molten thermoplastic polymeric film extruded from a die onto an electrically grounded quenching surface, which apparatus comprises at least one single-strand wire electrode extending across at least the full width of the extruded film, connected to a high voltage source and postioned substantially parallel to the quenching surface above the approximate touchdown points of the film, the improvement which consists in at least the centermost 90 percent of the wire electrode between the lateral edge portions of said film being insulated by a dielectric sheath and uninsulated portions being in proximity to the lateral edges of the molten film.
Claim 2
Dependent Claim
105 words
In an apparatus for pinning a molten thermoplastic polymeric film extruded from a die onto an electrically grounded quenching surface, which apparatus comprises at least one single-strand wire electrode extending across at least the full width of the extruded film, connected to a high voltage source and postioned substantially parallel to the quenching surface above the approximate touchdown points of the film, the improvement which consists in at least the centermost 90 percent of the wire electrode between the lateral edge portions of said film being insulated by a dielectric sheath and uninsulated portions being in proximity to the lateral edges of the molten film.
Claim 3
Dependent Claim
32 words
An apparatus of claim 1 wherein each of the lateral portions of the film in proximity to the uninsulated electrode comprises less than 5 percent of the total width of the film.
Claim 4
Dependent Claim
32 words
An apparatus of claim 1 wherein each of the lateral portions of the film in proximity to the uninsulated electrode comprises less than 3 percent of the total width of the film.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |