US3736492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film treating method
Assignee: Union Carbide Corp
•
Filing: 1971-01-14
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Granted: 1973-05-29
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Expires: 1991-01-14
Abstract
Abstract A method is disclosed for the surface treatment of a plastic body by exposure to a high intensity voltage accompanied by corona discharge wherein said voltage is a sequence of alternating-directional, sonic frequency pulses of electrical voltage.
Inventors
- 👤 L Rosenthal
- 👤 D Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:52
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/523
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 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, comprising exposing said surface to an alternatingdirectional sequence of pulse waveform electrical voltage in the sonic frequency range and accompanying corona discharge, whereby the rapid change of electrical voltage is maximized and the application of electric stress on all circuit components is minimized.
Claim 2
Dependent Claim
72 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, comprising exposing said surface to an alternatingdirectional sequence of pulse waveform electrical voltage in the sonic frequency range and accompanying corona discharge, whereby the rapid change of electrical voltage is maximized and the application of electric stress on all circuit components is minimized.
Claim 3
Dependent Claim
23 words
The process in accordance with claim 1, wherein said sequence of pulse waveform electrical voltage has a frequency in the range 20-5,000 Hz.
References Cited (Backward Citations)
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US3047789A
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US3263153A
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US3303406A
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US3391314A
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US3294971A
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US3496092A
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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 |