US4333121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused station protector
Assignee: AT&T Inc
•
Filing: 1980-08-15
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Granted: 1982-06-01
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Expires: 2000-08-15
Abstract
Abstract Apparatus for the electrical protection of communication circuits includes an insulative base (e.g., 13) having a line terminal (e.g., 3) and a station terminal (e.g., 1). A fuse wire (e.g., 2) is enclosed within a cavity (e.g., 21) within the base (e.g., 13). The fuse wire (e.g., 2) is connected in series between the line terminal (e.g., 3) and the station terminal (e.g., 1). The cavity (e.g., 21) is filled with an arc-extinguishing material (e.g., 22) to prevent a power arc when the fuse wire (e.g., 2) melts.
Inventors
- 👤 Alfred O. Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:16
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/44; H01H85/04; H01H85/05; H01H85/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A circuit protector comprising an insulative base having an elongated cavity, the cavity being shaped to have a pinched portion between two end portions, a line terminal held within the base and protruding into one end portion of the cavity, a station terminal held within the base and protruding into the other end portion of the cavity, a fuse wire connected between the line and station terminals within the cavity, and an arc-extinguishing material which fills the cavity and surrounds the fuse wire.
Claim 2
Dependent Claim
83 words
A circuit protector comprising an insulative base having an elongated cavity, the cavity being shaped to have a pinched portion between two end portions, a line terminal held within the base and protruding into one end portion of the cavity, a station terminal held within the base and protruding into the other end portion of the cavity, a fuse wire connected between the line and station terminals within the cavity, and an arc-extinguishing material which fills the cavity and surrounds the fuse wire.
Claim 3
Dependent Claim
82 words
Apparatus according to claim 1 further comprising a ground terminal held within the base and positioned between the line and station terminals, a voltage overload protector held within the base adjacent to the ground terminal, a first conductor embedded within the base and connected between the station terminal and one side of the voltage overload protector, and a second conductor contiguous with the surface of the base and connected between the ground terminal and the other side of the voltage overload protector.
Claim 4
Dependent Claim
23 words
Apparatus according to claim 1 further characterized in that said arc-extinguishing material (22) has the formula 2ZnO.3-B 2 O 3 .3.5H 2 O.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 1 further characterized in that said arc-extinguishing material (22) is in primarily powdered form.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |