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US3391371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overvoltage protective device
Assignee: Erie Technological Products Inc
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Filing: 1966-07-06
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Granted: 1968-07-02
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Expires: 1986-07-06
Abstract
No abstract record available.
Inventors
- 👤 Harold E Wright
- 👤 Edward E Leofsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:55
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
AN OVERVOLTAGE PROTECTIVE DEVICE COMPRISING A CYLINDRICAL CERAMIC BODY HAVING BETWEEN ITS ENDS AN INWARDLY EXTENDING CIRCUMFERENTIAL GROOVE OF DEPTH AT LEAST SUBSTANTIALLY EQUAL TO ITS AXIAL WIDTH, A PAIR OF METALLIZED COATINGS OVERLYING THE OUTER SURFACE OF THE BODY, SAID COATINGS BEING AXIALLY SPACED FROM EACH OTHER BY THE GROOVE TO PROVIDE AN ANNULAR AIR GAP, SAID COATINGS EXTENDING RESPECTIVELY ENDS OF THE BODY, THE DEPTH OF THE GROOVE TOWARD OPPOSITE ENDS OF THE BODY, THE DEPTH OF THE GROOVE AT LEAST SUBSTANTIALLY EQUAL TO THE AXIAL WIDTH OF THE GROOVE AND BEING MANY TIMES THE THICKNESS OF THE COATINGS WHEREBY THE SPARKING IS CONFINED TO THE AIR GAP BETWEEN THE COATINGS AND DOES NOT AFFECT THE BREAKDOWN VOLTAGE BY TRACKING THE CERAMIC.
Claim 2
Dependent Claim
124 words
AN OVERVOLTAGE PROTECTIVE DEVICE COMPRISING A CYLINDRICAL CERAMIC BODY HAVING BETWEEN ITS ENDS AN INWARDLY EXTENDING CIRCUMFERENTIAL GROOVE OF DEPTH AT LEAST SUBSTANTIALLY EQUAL TO ITS AXIAL WIDTH, A PAIR OF METALLIZED COATINGS OVERLYING THE OUTER SURFACE OF THE BODY, SAID COATINGS BEING AXIALLY SPACED FROM EACH OTHER BY THE GROOVE TO PROVIDE AN ANNULAR AIR GAP, SAID COATINGS EXTENDING RESPECTIVELY ENDS OF THE BODY, THE DEPTH OF THE GROOVE TOWARD OPPOSITE ENDS OF THE BODY, THE DEPTH OF THE GROOVE AT LEAST SUBSTANTIALLY EQUAL TO THE AXIAL WIDTH OF THE GROOVE AND BEING MANY TIMES THE THICKNESS OF THE COATINGS WHEREBY THE SPARKING IS CONFINED TO THE AIR GAP BETWEEN THE COATINGS AND DOES NOT AFFECT THE BREAKDOWN VOLTAGE BY TRACKING THE CERAMIC.
References Cited (Backward Citations)
US2288428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |