Patent US4628394A successfully refreshed from Google Patents.
US4628394A
Expired / Lapsed
US
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Voltage surge suppressor
Assignee: Corning Cable Systems Puerto Rico Inc
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Filing: 1984-09-27
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Granted: 1986-12-09
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Expires: 2004-09-27
Abstract
Abstract A transient voltage surge suppressor for an AC powerline comprises two semiconductor voltage limiting devices before a low pass LC filter and a third semiconductor voltage limiting device after the filter. The suppressor can be plugged into a 120 volt receptacle for protection of sensitive electronic equipment.
Inventors
- 👤 John J. Crosby
- 👤 John J. Napiorkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:07
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
A voltage surge suppressor for AC power lines comprising: a circuit, an RFI/EMI filter, a semiconductor voltage limiting device and an output to which electronic equipment can be connected; said circuit comprising an input consisting of a line, a neutral and a ground; a first varistor connected between the line and ground; a second varistor connected between the neutral and ground; said RFI/EMI filter comprising a first capacitor in parallel with the two varistors; a first choke connected in series with the line after the first varistor and first capacitor; a second choke connected in series with the neutral after the second varistor and first capacitor; said semiconductor voltage limiting device being a third varistor connected between the line and neutral after the two chokes; and a second capacitor in parallel with said third varistor.
Claim 2
Dependent Claim
135 words
A voltage surge suppressor for AC power lines comprising: a circuit, an RFI/EMI filter, a semiconductor voltage limiting device and an output to which electronic equipment can be connected; said circuit comprising an input consisting of a line, a neutral and a ground; a first varistor connected between the line and ground; a second varistor connected between the neutral and ground; said RFI/EMI filter comprising a first capacitor in parallel with the two varistors; a first choke connected in series with the line after the first varistor and first capacitor; a second choke connected in series with the neutral after the second varistor and first capacitor; said semiconductor voltage limiting device being a third varistor connected between the line and neutral after the two chokes; and a second capacitor in parallel with said third varistor.
Claim 3
Dependent Claim
23 words
The suppressor of claim 1 wherein the circuit includes a light emitting diode to indicate when electrical power is supplied to the input.
Claim 4
Dependent Claim
19 words
The suppressor of claim 1 wherein the circuit includes a PTC protector in series with one of the varistors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |