US3736493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film treating process
Assignee: Union Carbide Corp
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Filing: 1971-01-14
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Granted: 1973-05-29
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Expires: 1991-01-14
Abstract
Abstract A process is disclosed for the surface treatment of a plastic body, employing an alternating voltage of high intensity accompanied by corona discharge, which comprises exposing said surface to high frequency alternating voltage and accompanying corona discharge, the frequency of said alternating voltage being adjusted to effect surface treatment under optimum loading conditions at any selected constant voltage level.
Inventors
- 👤 L Rosenthal
- 👤 D Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:42
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/523
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
A process for the surface treatment of a plastic body with an alternating voltage of high intensity accompanied by corona discharge, wherein the treatment zone constitutes a capacitive load which for a given input voltage provides a linear relationship between frequency and current, comprising exposing said surface to an alternating, adjustable frequency, selected constant voltage in the sonic frequency range and accompanying corona discharge and adjusting the frequency of said constant voltage to provide surface treatment under optimum loading conditions.
Claim 2
Dependent Claim
80 words
A process for the surface treatment of a plastic body with an alternating voltage of high intensity accompanied by corona discharge, wherein the treatment zone constitutes a capacitive load which for a given input voltage provides a linear relationship between frequency and current, comprising exposing said surface to an alternating, adjustable frequency, selected constant voltage in the sonic frequency range and accompanying corona discharge and adjusting the frequency of said constant voltage to provide surface treatment under optimum loading conditions.
Claim 3
Dependent Claim
18 words
A process in accordance with claim 1, wherein said frequency is in the range of from 20-5000 Hz.
Claim 4
Dependent Claim
15 words
A process in accordance with claim 1, wherein said alternating voltage has a square waveform.
Claim 5
Dependent Claim
15 words
A process in accordance with claim 1, wherein said alternating voltage has a pulse waveform.
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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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |