US4481501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer arrangement for coupling a communication signal to a three-phase power line
Assignee: Sensus Spectrum LLC
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Filing: 1981-01-26
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Granted: 1984-11-06
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Expires: 2001-01-26
Abstract
Abstract A communication signal is coupled simultaneously to all three phases of a three-power line through a three-phase open delta transformer with the communication signal being applied across the low voltage pair of windings.
Inventors
- 👤 William C. Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:02
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B3/56; H04B2203/00; H04B2203/54; H04B2203/5462; H04B2203/5466; H04B2203/5483
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A transformer arrangement for simultaneously coupling a signal to all three phase conductors of a three-phase power line, comprising: a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected across which the signal is applied, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the current flowing through and between said high voltage windings is the same.
Claim 2
Dependent Claim
110 words
A transformer arrangement for simultaneously coupling a signal to all three phase conductors of a three-phase power line, comprising: a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected across which the signal is applied, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the current flowing through and between said high voltage windings is the same.
Claim 3
Dependent Claim
111 words
Signaling apparatus for simultaneously coupling a signal to all three phase conductors of a three-phase power line, comprising: an AC signal device; a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected to said signaling device, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the current flowing through and between said high voltage windings is the same.
Claim 4
Dependent Claim
111 words
Signaling apparatus for simultaneously coupling a signal to all three phase conductors of a three-phase power line, comprising: an AC signal device; a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected to said signaling device, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the current flowing through and between said high voltage windings is the same.
Claim 5
Dependent Claim
105 words
A signaling system, comprising: a three-phase power line comprising three phase conductors; an AC signaling device; a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected to said signaling device, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the current flowing through and between said high voltage windings is the same.
Claim 6
Dependent Claim
105 words
A signaling system, comprising: a three-phase power line comprising three phase conductors; an AC signaling device; a pair of high voltage windings serially connected, with their commonly connected leads being connected to one phase of the power line and the uncommon lead of each winding being connected to a different one of the other two phases of the power line; a pair of low voltage windings serially connected to said signaling device, and means for magnetically coupling each winding of one pair with a different winding of the other pair so that the current flowing through and between said high voltage windings is the same.
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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |