US4145386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the surface treatment of thermoplastic materials
Assignee: Union Carbide Corp
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Filing: 1977-06-29
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Granted: 1979-03-20
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Expires: 1997-06-29
Abstract
Abstract In the corona discharge surface treatment of a continuum of thermoplastic material passed through an air gap between stationary and roller electrodes across which a high voltage is impressed, the improvement which comprises employing as said stationary electrode a metallic substrate of high electrical conductivity and a continuous coating layer of porcelain enamel dielectric material.
Inventors
- 👤 Louis A. Rosenthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:49
CPC Classifications
B; B41; B41F; B41F23/00; B41F23/007; H; H01; H01T; H01T19/00; H05; H05B; H05B7/00; H05B7/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
In a process for the corona discharge surface treatment of thermoplastic material, wherein a continuum of said material is passed through an air gap between stationary bar type and relatively large roller type electrodes across which high voltage is impressed, the improvement which comprises employing, as said stationary bar type electrode, a metallic substrate of high electrical conductivity having a continuous coating layer of porcelain enamel dielectric material; and an outer continuous shielding layer of material thereover consisting essentially of at least one member selected from the group consisting of refractory metal oxides, nitrides, carbides and borides having properties of high mechanical strength, chemical stability at elevated temperatures and high thermal conductivity.
Claim 2
Dependent Claim
112 words
In a process for the corona discharge surface treatment of thermoplastic material, wherein a continuum of said material is passed through an air gap between stationary bar type and relatively large roller type electrodes across which high voltage is impressed, the improvement which comprises employing, as said stationary bar type electrode, a metallic substrate of high electrical conductivity having a continuous coating layer of porcelain enamel dielectric material; and an outer continuous shielding layer of material thereover consisting essentially of at least one member selected from the group consisting of refractory metal oxides, nitrides, carbides and borides having properties of high mechanical strength, chemical stability at elevated temperatures and high thermal conductivity.
Claim 3
Dependent Claim
38 words
The process as claimed in claim 1, wherein said continuum of thermoplastic material to be treated is maintained during treatment in contact with said roller electrode and spaced from said stationary electrode to provide an air gap therebetween.
Claim 4
Dependent Claim
18 words
The process as claimed in claim 2, wherein said outer continuous shielding layer consists essentially of aluminum oxide.
References Cited (Backward Citations)
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US3954586A
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US3779882A
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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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |