Patent US3889222A successfully refreshed from Google Patents.
US3889222A
Expired / Lapsed
US
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Surge voltage absorber
Assignee: Toshiba Corp
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Filing: 1973-11-07
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Granted: 1975-06-10
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Expires: 1993-11-07
Abstract
Abstract A surge voltage absorber wherein a first external connection terminal, at least one nonlinear resistance element made of metal oxide, a fusible element and a second external connection terminal bored with a penetrating hole are held by a holding structure so as to form an electrical series circuit; when the surge absorber is broken by surge voltage, a fusible element is melted away; and at this time a display member received in the recess of the second external connection terminal is made to project through the aforesaid penetrating hole by means of a biasing device also disposed in said recess.
Inventors
- 👤 Ikuo Takano
- 👤 Yasutaka Imajyo
- 👤 Akira Tanimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:00
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/12; H01C7/126; H01T; H01T1/00; H01T1/12; H01H; H01H85/00; H01H85/02; H01H85/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
A surge voltage absorber which comprises a holding structure; a first external connection terminal provided at one end of said holding structure; a second external connection terminal having a penetrating hole and provided at the other end of said holding structure; at least one nonlinear resistance element made of metal oxide and provided within said holding structure so as to be electrically connected to said first external connection terminal at its one end; a first fusible element arranged so as to be electrically connected at its one end to the other end of said nonlinear resistance element; a display member disposed in a recess of said second external terminal, Connected to the other end of said fusible element and displaceable to the outside through said penetrating hole; and a biasing device which electrically contacts said second external connection terminal and said display member and causes said display member to project through said penetrating hole when said fusible element is melted away.
Claim 2
Dependent Claim
161 words
A surge voltage absorber which comprises a holding structure; a first external connection terminal provided at one end of said holding structure; a second external connection terminal having a penetrating hole and provided at the other end of said holding structure; at least one nonlinear resistance element made of metal oxide and provided within said holding structure so as to be electrically connected to said first external connection terminal at its one end; a first fusible element arranged so as to be electrically connected at its one end to the other end of said nonlinear resistance element; a display member disposed in a recess of said second external terminal, Connected to the other end of said fusible element and displaceable to the outside through said penetrating hole; and a biasing device which electrically contacts said second external connection terminal and said display member and causes said display member to project through said penetrating hole when said fusible element is melted away.
Claim 3
Dependent Claim
61 words
A surge voltage absorber according to claim 1 wherein the electrical connection between said other end of said nonlinear resistance element and said one end of said fusible element is effected by a conductor contacting said other end of said nonlinear resistance element and a low-melting metal piece for fixing said one end of said first fusible element to said conductor.
Claim 4
Dependent Claim
52 words
A surge voltage absorber according to claim 2 further comprising a second fusible element connected at both ends to said conductor contacting said other end of said nonlinear resistance element and said second external connection terminal respectively, said second fusible element having a smaller degree of resistance than said first fusible element.
Claim 5
Dependent Claim
138 words
A surge voltage absorber according to claim 1 wherein the holding structure consists of a first envelope containing at least one nonlinear resistance element made of metal oxide, a first terminal electrically connected to one side of the nonlinear resistance element and a second terminal, electrically connected to the other side of the resistance element and a second envelope containing a third terminal electrically connected to one end of the first fusible element, fourth terminal electrically connected to the other end of said first fusible element and bored with the penetrating hole, said display member and biasing device; the third terminal of the second envelope is detachably inserted into the first terminal of the first envelope; and the second terminal is used as the first external connection terminal and the fourth terminal as the second external connection terminal.
Claim 6
Dependent Claim
61 words
A surge voltage absorber according to claim 4 wherein the third terminal of the second external envelope has a projecting portion contacting the nonlinear resistance element, the first fusible element being fixed at one end to said projecting portion by means of a low-melting metal piece readily melting when the nonlinear resistance element is raised to a higher temperature than prescribed.
Claim 7
Dependent Claim
64 words
A surge voltage absorber according to claim 5 further comprising a second fusible element connected between the third terminal of the second envelope and the fourth terminal, said second fusible element having a smaller degree of resistance than the first fusible element so as to melt away when impressed with surge current prior to or simultaneously with the melting of the first fusible element.
Claim 8
Dependent Claim
145 words
A surge voltage absorber according to claim 1 wherein the holding structure consists of a plurality of first envelopes each containing at least one nonlinear resistance element made of metal oxide, a first terminal electrically connected to one side of the nonlinear resistance element and a second terminal electrically connected to the other side of the resistance element and a second envelope containing a third terminal electrically connected to one end of the first fusible element, fourth terminal electrically connected to the other end of said first fusible element and bored with the penetrating hole, said display member and biasing device; said first envelopes are connected in series by inserting the second terminal of a first envelope to the first terminal of another first envelope and said third terminal of second envelope is inserted to the outermost first terminal of said series connected first envelopes.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |