US3763410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating material by electrical discharge
Assignee: EIDP Inc
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Filing: 1971-09-17
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Granted: 1973-10-02
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Expires: 1991-09-17
Abstract
Abstract A method of treating, by electrical discharge, a web of polymeric film wherein the treatment is controlled by monitoring the output current at the electrical discharge treating means and by transmitting this monitored information to a currentcontrolling means to actuate it whereby to maintain the output current at the electrical discharge treating means within predetermined limits.
Inventors
- 👤 T Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:40
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/32; B; B29; B29C; B29C59/00; B29C59/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
A method of treating a web of polymeric film by alternating current electrical discharge including the steps of: moving the web past a web-treating means connected to an alternating current power source; treating the web by high-frequency, alternating current electrical discharge by the web-treating means; controlling the current being supplied by the web-treating means at the point of treatment by current-controlling means connected to the power source and to the web-treating means; the current-controlling means including a magnetic amplifier coupled to a step-up transformer having a primary winding and a secondary winding, the primary winding being connected to the power source and the secondary winding being connected to the web-treating means in a treatment circuit; monitoring such current by current-monitoring means connected in series to the current-controlling means; and transmitting a current signal which is instantly directly proportional to such current to the current-controlling means whereby the current-controlling means is actuated thereby to maintain such current within the predetermined limits.
Claim 2
Independent Claim
160 words
A method of treating a web of polymeric film by alternating current electrical discharge including the steps of: moving the web past a web-treating means connected to an alternating current power source; treating the web by high-frequency, alternating current electrical discharge by the web-treating means; controlling the current being supplied by the web-treating means at the point of treatment by current-controlling means connected to the power source and to the web-treating means; the current-controlling means including a magnetic amplifier coupled to a step-up transformer having a primary winding and a secondary winding, the primary winding being connected to the power source and the secondary winding being connected to the web-treating means in a treatment circuit; monitoring such current by current-monitoring means connected in series to the current-controlling means; and transmitting a current signal which is instantly directly proportional to such current to the current-controlling means whereby the current-controlling means is actuated thereby to maintain such current within the predetermined limits.
Claim 3
Independent Claim
82 words
A method of treating a web of polymeric film by alternating current electrical discharge including the steps of: moving the web past a web-treating means; treating the web by high-frequency alternating current by the web treating means; transmitting a current signal which is instantly directly proportional to such current to current-controlling means; maintaining such current within predetermined limits based on such signal from said current monitoring means; and wherein the web-treating means, the current-monitoring means, and the current-controlling means are in series.
Claim 4
Independent Claim
82 words
A method of treating a web of polymeric film by alternating current electrical discharge including the steps of: moving the web past a web-treating means; treating the web by high-frequency alternating current by the web treating means; transmitting a current signal which is instantly directly proportional to such current to current-controlling means; maintaining such current within predetermined limits based on such signal from said current monitoring means; and wherein the web-treating means, the current-monitoring means, and the current-controlling means are in series.
Claim 5
Independent Claim
92 words
A method of treating a web of a polymeric film by an alternating current electrical discharge including the steps of: moving the web past a web-treating means; conducting an alternating current to the web-treating means through an electrical circuit; inductively sensing at the point of treatment the alternating current to the web-treating means in the electrical circuit at the point of treatment to provide an alternating current signal proportional to the current at the web-treating means; utilizing the alternating current signal to maintain the current to the web-treating means within predetermined limits.
Claim 6
Independent Claim
92 words
A method of treating a web of a polymeric film by an alternating current electrical discharge including the steps of: moving the web past a web-treating means; conducting an alternating current to the web-treating means through an electrical circuit; inductively sensing at the point of treatment the alternating current to the web-treating means in the electrical circuit at the point of treatment to provide an alternating current signal proportional to the current at the web-treating means; utilizing the alternating current signal to maintain the current to the web-treating means within predetermined limits.
Claim 7
Independent Claim
143 words
A method of treating a web of a polymeric film by an alternating current electrical discharge including the steps of: moving the web past a web-treating means; conducting an alternating current to the web-treating means through an electrical circuit; inductively sensing at the point of treatment the alternating current to the web-treating means in the electrical circuit at the point of treatment to provide an alternating current signal which is proportional to the current at the web-treating means; feeding back the alternating current signal through a rectifier to change the alternating current signal to a direct current signal; passing the direct current signal through a control winding of a magnetic amplifier through an adjustable resistor; adjusting the restistor to determine the sensitivity of the control in which increases and decreases in the sensed alternating current signal maintain the treatment current within preselected limits.
Claim 8
Independent Claim
143 words
A method of treating a web of a polymeric film by an alternating current electrical discharge including the steps of: moving the web past a web-treating means; conducting an alternating current to the web-treating means through an electrical circuit; inductively sensing at the point of treatment the alternating current to the web-treating means in the electrical circuit at the point of treatment to provide an alternating current signal which is proportional to the current at the web-treating means; feeding back the alternating current signal through a rectifier to change the alternating current signal to a direct current signal; passing the direct current signal through a control winding of a magnetic amplifier through an adjustable resistor; adjusting the restistor to determine the sensitivity of the control in which increases and decreases in the sensed alternating current signal maintain the treatment current within preselected limits.
Claim 9
Dependent Claim
26 words
The meThod of claim 4 wherein the treating is conducted in parallel with at least one other treating station coupled to the same source of power.
References Cited (Backward Citations)
US2259647A
Cited
US2272756A
Cited
US2365611A
Cited
US2767359A
Cited
US2733306A
Cited
US3180974A
Cited
US3308045A
Cited
US3351851A
Cited
US3391314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |