US4472754A
Expired / Lapsed
US
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Surge arrester with a bypass gap
Assignee: Hitachi Ltd
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Filing: 1982-07-16
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Granted: 1984-09-18
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Expires: 2002-07-16
Abstract
Abstract A surge arrester having a first non-linear resistor block, a second non-linear resistor block connected in series with the first non-linear resistor block, a bypass gap connected in parallel with the second non-linear resistor block, and a linear resistor connected in parallel with at least one of the first and second non-linear resistor blocks.
Inventors
- 👤 Akio Mizukoshi
- 👤 Katuji Shindo
- 👤 Yoshi Akatsu
- 👤 Jun Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:46
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/16; H02; H02H; H02H9/00; H02H9/04; H02H9/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
58 words
A surge arrester with a bypass gap comprising: a first non-linear resistor block; a second non-linear resistor block connected in series with the first non-linear resistor block; a bypass gap connected in parallel with the second non-linear resistor block; and a linear resistor connected in parallel with at least one of the first and second non-linear resistor blocks.
Claim 2
Dependent Claim
58 words
A surge arrester with a bypass gap comprising: a first non-linear resistor block; a second non-linear resistor block connected in series with the first non-linear resistor block; a bypass gap connected in parallel with the second non-linear resistor block; and a linear resistor connected in parallel with at least one of the first and second non-linear resistor blocks.
Claim 3
Dependent Claim
41 words
A surge arrester with a bypass gap as defined in claim 1, wherein the linear resistor with AC voltage applied exhibits a resistance smaller than the resistance of the non-linear resistor block which is connected in parallel with the linear resistor.
Claim 4
Dependent Claim
25 words
A surge arrester with a bypass gap as defined in claim 1, wherein the first and second non-linear blocks are formed mainly of zinc oxide.
Claim 5
Dependent Claim
26 words
A surge arrester with a bypass gap as defined in claim 1, wherein the linear resistor is connected in parallel with the first non-linear resistor block.
Claim 6
Dependent Claim
26 words
A surge arrester with a bypass gap as defined in claim 1, wherein the linear resistor is connected in parallel with the second non-linear resistor block.
Claim 7
Dependent Claim
46 words
A surge arrester with a bypass gap as defined in claim 1, wherein two linear resistors are provided, one linear resistor being connected in parallel with the first non-linear resistor block, and the other linear resistor being connected in parallel with the second non-linear resistor block.
Claim 8
Dependent Claim
68 words
A surge arrester with a bypass gap as defined in claim 6, wherein the one linear resistor with AC voltage applied exhibits a resistance smaller than the resistance of the first non-linear resistor block which is connected in parallel therewith, and the other linear resistor with AC voltage applied exhibits a resistance smaller than the resistance of the second non-linear resistor block which is connected in parallel therewith.
Claim 9
Dependent Claim
26 words
A surge arrester with a bypass gap as defined in claim 7, wherein the first and second non-linear resistor blocks are formed mainly of zinc oxide.
Claim 10
Dependent Claim
89 words
A surge arrester with a bypass gap comprising a first non-linear resistor block, a second non-linear resistor block connected in series with the first non-linear resistor block, a bypass gap connected in parallel with the second non-linear resistor block, and means for reducing a transient voltage which appears after a sparking of the bypass gap so as to prevent restriking of an arc, the means for reducing the transient voltage including a linear resistor connected in parallel with at least one of the first and second non-linear resistor blocks.
Claim 11
Dependent Claim
89 words
A surge arrester with a bypass gap comprising a first non-linear resistor block, a second non-linear resistor block connected in series with the first non-linear resistor block, a bypass gap connected in parallel with the second non-linear resistor block, and means for reducing a transient voltage which appears after a sparking of the bypass gap so as to prevent restriking of an arc, the means for reducing the transient voltage including a linear resistor connected in parallel with at least one of the first and second non-linear resistor blocks.
Claim 12
Dependent Claim
26 words
A surge arrester with a bypass gap as defined in claim 9, wherein the first and second non-linear resistor blocks are formed mainly of zinc oxide.
Claim 13
Dependent Claim
38 words
A surge arrester with a bypass gap as defined in claim 10, wherein the linear resistor with AC voltage applied exhibits a resistance smaller than the resistance of the non-linear resistor block which is connected in parallel therewith.
Claim 14
Dependent Claim
26 words
A surge arrester with a bypass gap as defined in claim 11, wherein the linear resistor is connected in parallel with the first non-linear resistor block.
Claim 15
Dependent Claim
26 words
A surge arrester with a bypass gap as defined in claim 11, wherein the linear resistor is connected in parallel with the second non-linear resistor block.
Claim 16
Dependent Claim
46 words
A surge arrester with a bypass gap as defined in claim 11, wherein two linear resistors are provided, one linear resistor being connected in parallel with the first non-linear resistor block, and the other linear resistor being connected in parallel with the second non-linear resistor block.
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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |