Patent US2221296A successfully refreshed from Google Patents.
Patent US3780350A successfully refreshed from Google Patents.
US3780350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge arrester
Assignee: SPX Technologies Inc
•
Filing: 1971-12-16
•
Granted: 1973-12-18
•
Expires: 1991-12-16
Abstract
Abstract A surge protection device has been provided having a central ground electrode disposed midway between spaced terminal electrodes. The improvement includes a ground electrode having a central annular opening and line terminal electrodes axially disposed at opposite sides of the ground electrode, each line terminal electrode being formed with an annular boss extending partly within the opening of the ground electrode. Means including insulative spacers between electrodes forms an air tight cavity for gas in the vicinity of bosses and the annular opening of the electrodes for discharge of the surges through said cavity.
Inventors
- 👤 D Sanger
- 👤 J Langan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:47
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/10; H01T4/12; H02; H02H; H02H9/00; H02H9/04; H02H9/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
221 words
A surge protective device having a tubular chamber for containing an ionization gas wherein the improvement comprises, a. a longitudinal tubular housing of insulating material having an annular grounding electrode disposed at an intermediate point therein, and b. oppositely disposed coaxial line electrodes with one closing one end, and the other closing the other end, of the tubular housing and having coaxial cylindrical inner ends with oppositely disposed faces proportioned to make the spacing between their peripheries be less than the spacing between other parts of said faces and positioned so that their peripheries have substantially the same spacing from the inner periphery of the annular grounding electrode for providing a substantially uniform inter-electrode gap in the common region between the line electrodes and between each line electrode and the inner Periphery of the grounding electrode, and wherein the line electrodes have a frustoconical intermediate portion and the grounding electrode has complementary portions cooperationg with the line electrodes to form second relatively wider gaps between the respective line electrodes and the grounding electrode, c. whereby said common region is the region of greatest probability of initial ionization and in response to the ionization of the gas in the gap between any two electrodes in said common region all electrodes are immediately clamped at or near the potential of the grounding electrode.
Claim 2
Dependent Claim
221 words
A surge protective device having a tubular chamber for containing an ionization gas wherein the improvement comprises, a. a longitudinal tubular housing of insulating material having an annular grounding electrode disposed at an intermediate point therein, and b. oppositely disposed coaxial line electrodes with one closing one end, and the other closing the other end, of the tubular housing and having coaxial cylindrical inner ends with oppositely disposed faces proportioned to make the spacing between their peripheries be less than the spacing between other parts of said faces and positioned so that their peripheries have substantially the same spacing from the inner periphery of the annular grounding electrode for providing a substantially uniform inter-electrode gap in the common region between the line electrodes and between each line electrode and the inner Periphery of the grounding electrode, and wherein the line electrodes have a frustoconical intermediate portion and the grounding electrode has complementary portions cooperationg with the line electrodes to form second relatively wider gaps between the respective line electrodes and the grounding electrode, c. whereby said common region is the region of greatest probability of initial ionization and in response to the ionization of the gas in the gap between any two electrodes in said common region all electrodes are immediately clamped at or near the potential of the grounding electrode.
Claim 3
Dependent Claim
209 words
A surge protection device having a tubular chamber for containing an ionization gas wherein the improvement comprises, a. a longitudinal tubular housing of insulating material having an annular grounding electrode disposed at an intermediate point therein and having sputter shields for preventing the deposit of metal at junctions of the ground electrode and the inner periphery of the insulating material, and b. oppositely disposed coaxial line electrodes with one closing one end, and the other closing the other end, of the tubular housing and having coaxial cylindrical inner ends with oppositely disposed faces proportioned to make the spacing between their peripheries be less than the spacing between other parts of said faces and positioned so that their peripheries have substantially the same spacing from the inner periphery of the annular grounding electrode for providing a substantially uniform inter-electrode gap is in the common region between the line electrodes and between each line electrode and the inner periphery of the grounding electrode, c. whereby said common region is the region of greatest probability of initial ionization and in response to the ionization of the gas in the gap between any two electrodes in said common region all electrodes are immediately clamped at or near the potential of the grounding electrode.
Claim 4
Dependent Claim
209 words
A surge protection device having a tubular chamber for containing an ionization gas wherein the improvement comprises, a. a longitudinal tubular housing of insulating material having an annular grounding electrode disposed at an intermediate point therein and having sputter shields for preventing the deposit of metal at junctions of the ground electrode and the inner periphery of the insulating material, and b. oppositely disposed coaxial line electrodes with one closing one end, and the other closing the other end, of the tubular housing and having coaxial cylindrical inner ends with oppositely disposed faces proportioned to make the spacing between their peripheries be less than the spacing between other parts of said faces and positioned so that their peripheries have substantially the same spacing from the inner periphery of the annular grounding electrode for providing a substantially uniform inter-electrode gap is in the common region between the line electrodes and between each line electrode and the inner periphery of the grounding electrode, c. whereby said common region is the region of greatest probability of initial ionization and in response to the ionization of the gas in the gap between any two electrodes in said common region all electrodes are immediately clamped at or near the potential of the grounding electrode.
Claim 5
Dependent Claim
221 words
A surge protective device having a tubular chamber for containing an ionization gas wherein the improvement comprises, a. a longitudinal tubular housing of insulating material having an annular grounding electrode disposed at an intermediate point therein, b. oppositely disposed coaxial line electrodes with one closing one end, and the other closing the other end, of the tubular housing and having coaxial cylindrical inner ends with oppositely disposed faces proportioned to make the spacing between their peripheries be less than the spacing between other parts of said faces and positioned so that their peripheries have substantially the same spacing from the inner periphery of the annular grounding electrode for providing a substantially uniform inter-electrode gap in the common region between the line electrodes and between each line electrode and the inner periphery of the grounding electrode, and c. an evacuation tube extending coaxially through one of the line electrodes for proportioning its face so that the peripheries of the oppositely disposed faces are closer together than the central portions of the oppositely disposed faces. d. whereby said common region is the region of greatest probability of initial ionization and in response to the ionization of the gas in the gap between any two electrodes in said common region all electrodes are immediately clamped at or near the potential of the grounding electrode.
Claim 6
Dependent Claim
221 words
A surge protective device having a tubular chamber for containing an ionization gas wherein the improvement comprises, a. a longitudinal tubular housing of insulating material having an annular grounding electrode disposed at an intermediate point therein, b. oppositely disposed coaxial line electrodes with one closing one end, and the other closing the other end, of the tubular housing and having coaxial cylindrical inner ends with oppositely disposed faces proportioned to make the spacing between their peripheries be less than the spacing between other parts of said faces and positioned so that their peripheries have substantially the same spacing from the inner periphery of the annular grounding electrode for providing a substantially uniform inter-electrode gap in the common region between the line electrodes and between each line electrode and the inner periphery of the grounding electrode, and c. an evacuation tube extending coaxially through one of the line electrodes for proportioning its face so that the peripheries of the oppositely disposed faces are closer together than the central portions of the oppositely disposed faces. d. whereby said common region is the region of greatest probability of initial ionization and in response to the ionization of the gas in the gap between any two electrodes in said common region all electrodes are immediately clamped at or near the potential of the grounding electrode.
Claim 7
Dependent Claim
30 words
A surge protective device according to claim 2 wherein additional sputter shields are provided for preventing the deposit of metal at junctions of the line electrodes and the insulating material.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |