Patent US3636409A successfully refreshed from Google Patents.
US3636409A
Expired / Lapsed
US
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Electrical ground filter means for boats supplied with a shore-based source of alternating current power
Assignee: Electrocatalytic Inc
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Filing: 1970-11-17
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Granted: 1972-01-18
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Expires: 1990-11-17
Abstract
Abstract An electrical ground filter means for boats or other vessels supplied with a shore-based source of alternating current power having current leads and an electrical grounding lead connected between the alternating current source and a boat, the ground filter means comprising a first pair of rectifiers in series with each other, a second pair of rectifiers in series with each other and of opposite polarity with the first pair, a capacitor means, the first and second pairs of rectifiers and the capacitor means being connected electrically in parallel of each other.
Inventors
- 👤 Frank H Stephens Jr
- 👤 Paul B Byrne
- 👤 Edward P Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:24
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/04; B; B63; B63J; B63J3/00; B63J3/04; B63J2003/043
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
An electrical ground filter means for vessels supplied with a shore-based source of alternating current power, current leads and an electrical grounding lead connected between the power source and the vessel, the ground filter means being connected in series with the grounding lead, the filter means comprising a first pair of rectifiers in series with each other, a second pair of rectifiers in series with each other and of opposite polarity with the first pair of rectifiers, a capacitor means, the first and second pairs of rectifiers and the capacitor means being connected electrically in parallel with each other.
Claim 2
Dependent Claim
99 words
An electrical ground filter means for vessels supplied with a shore-based source of alternating current power, current leads and an electrical grounding lead connected between the power source and the vessel, the ground filter means being connected in series with the grounding lead, the filter means comprising a first pair of rectifiers in series with each other, a second pair of rectifiers in series with each other and of opposite polarity with the first pair of rectifiers, a capacitor means, the first and second pairs of rectifiers and the capacitor means being connected electrically in parallel with each other.
Claim 3
Dependent Claim
27 words
An electrical ground filter means according to claim 1, wherein the capacitor means comprises a pair of capacitors in series with each other and of opposite Polarities.
Claim 4
Dependent Claim
26 words
An electrical ground filter means according to claim 1, wherein the first and second pairs of rectifiers are in the form of a single-piece semiconductor device.
Claim 5
Dependent Claim
61 words
An electrical ground filter means for the elimination of corrosive galvanic currents, the filter means being electrically series connected between two dissimilar metals disposed in a common electrolyte, the filter means having an impedance less than 0.1 ohm to alternating currents of 60 hertz and an impedance of at least 1,000 ohms at voltages of up to 0.9 volt direct current
Claim 6
Dependent Claim
61 words
An electrical ground filter means for the elimination of corrosive galvanic currents, the filter means being electrically series connected between two dissimilar metals disposed in a common electrolyte, the filter means having an impedance less than 0.1 ohm to alternating currents of 60 hertz and an impedance of at least 1,000 ohms at voltages of up to 0.9 volt direct current
Claim 7
Dependent Claim
26 words
An electrical ground filter means according to claim 4, wherein the filter means is characterized by the passage of fault currents of at least 1,000 amperes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |