Patent US3736437A successfully refreshed from Google Patents.
US3736437A
Expired / Lapsed
US
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Vacuum switch apparatus
Assignee: Toshiba Corp
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Filing: 1971-01-12
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Granted: 1973-05-29
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Expires: 1991-01-12
Abstract
Abstract A vacuum switch apparatus comprising a vacuum switch having a pair of electrodes, and a series circuit consisting of a resistor and capacitor disposed between one of said electrodes and ground to suppress the oscillation of abnormal voltage generated at the opening of said switch. The resistor preferably has a value of 100 ohms and the capacitor preferably has a value of 0.1 Mu F.
Inventors
- 👤 A Nabae
- 👤 M Okawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:55
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/59; H01H33/60; H01H33/66
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
84 words
A vacuum switch apparatus comprising at least one vacuum switch having a pair of electrodes and an RC surge suppressor circuit coupled between one of said electrodes and ground, said surge suppressor circuit being comprised of a series connection of a resistor R and a capacitor C, the values of said resistor R and capacitor C satisfying the following: n > OR = 8(m+1)/m-8 m > 8 R1 < OR = R < OR = R2 where n C/Ce, m Ce/Cs, q 1+n+m and
Claim 2
Dependent Claim
84 words
A vacuum switch apparatus comprising at least one vacuum switch having a pair of electrodes and an RC surge suppressor circuit coupled between one of said electrodes and ground, said surge suppressor circuit being comprised of a series connection of a resistor R and a capacitor C, the values of said resistor R and capacitor C satisfying the following: n > OR = 8(m+1)/m-8 m > 8 R1 < OR = R < OR = R2 where n C/Ce, m Ce/Cs, q 1+n+m and
Claim 3
Dependent Claim
46 words
A vacuum switch apparatus according to claim 1 comprising three RC surge suppressor circuits, and wherein said vacuum switch is of the three phase type having three pairs of electrodes, one electrode of eacH pair being connected to ground through a respective RC surge suppressor circuit.
Claim 4
Dependent Claim
23 words
A vacuum switch apparatus according to claim 1 comprising test means connected to said surge suppressor circuit for a short circuit test thereof.
Claim 5
Dependent Claim
31 words
A vacuum switch apparatus according to claim 1 wherein said resistor is chosen to have a resistance of 100 ohms and said capacitor to have a capacity of 0.1 Mu F.
Claim 6
Dependent Claim
80 words
A vacuum switch apparatus comprising at least one vacuum switch having a pair of electrodes and an RC surge suppressor circuit coupled between said electrodes, said surge suppressor circuit being comprised of a series connection of a resistor R and a capacitor C, the values of said resistor R and capacitor C satisfying the following: n > or = 8(m+1)/m-8 m > 8 R1 < or = R < or = R2 where n C/Ce, m Ce/Cs, q 1+n+m and
Claim 7
Dependent Claim
80 words
A vacuum switch apparatus comprising at least one vacuum switch having a pair of electrodes and an RC surge suppressor circuit coupled between said electrodes, said surge suppressor circuit being comprised of a series connection of a resistor R and a capacitor C, the values of said resistor R and capacitor C satisfying the following: n > or = 8(m+1)/m-8 m > 8 R1 < or = R < or = R2 where n C/Ce, m Ce/Cs, q 1+n+m and
Claim 8
Dependent Claim
43 words
A vacuum switch apparatus according to claim 5 comprising three RC surge suppressor circuits, and wherein said vacuum switch is of the three phase type having three pairs of electrodes, each surge suppressor circuit being connected between respective pairs of said switch electrodes.
Claim 9
Dependent Claim
31 words
A vacuum switch apparatus according to claim 5 wherein said resistor is chosen to have a resistance of 100 ohms and said capacitor to have a capacity of 0.1 Mu F.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |