Patent US4451804A successfully refreshed from Google Patents.
US4451804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four-terminal network
Assignee: Individual
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Filing: 1982-05-03
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Granted: 1984-05-29
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Expires: 2002-05-03
Abstract
Abstract A four-terminal network, especially for filtering frequency bands or values, behaves as an ideal winding, therefore ensures high selectivity and, if equipped with an iron core, the possibility of carrying out switch operations. The network includes a pair of closely adjacent inductor coils having parallel turns for current in opposite directions, and equal inductance with a capacitor connected to at least one end of one of the coils.
Inventors
- 👤 Gyorgy Veisz
- 👤 Gabor David
- 👤 Peter Koszeghy
- 👤 Lajos Szekely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:19
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/17; H03H7/1741; H03H7/175; H03H7/09; H03H7/1708
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
187 words
A four-terminal network, comprising: a first input terminal; a second input terminal; a first output terminal; a second output terminal connected to said first input terminal at an intermediate point; a first inductance winding having one end connected to said first input terminal, an opposite end and a plurality of turns for conducting current; a second inductance winding having one end connected to said first output terminal, an opposite end connected to said opposite end of said first inductance winding at a common point, and a plurality of turns; and a condenser connected between said common point and said intermediate point; said first and second inductance windings being selected to have substantially identical inductance, to be disposed clearly adjacent each other with each turn of said first inductance winding being adjacent a respective turn of said second inductance winding, said turns of said first and second inductance windings being disposed so that current flows in said first inductance winding in a direction opposite to the direction in which current flows in said second inductance winding, and said first and second inductance windings extending parallel to each other.
Claim 2
Dependent Claim
187 words
A four-terminal network, comprising: a first input terminal; a second input terminal; a first output terminal; a second output terminal connected to said first input terminal at an intermediate point; a first inductance winding having one end connected to said first input terminal, an opposite end and a plurality of turns for conducting current; a second inductance winding having one end connected to said first output terminal, an opposite end connected to said opposite end of said first inductance winding at a common point, and a plurality of turns; and a condenser connected between said common point and said intermediate point; said first and second inductance windings being selected to have substantially identical inductance, to be disposed clearly adjacent each other with each turn of said first inductance winding being adjacent a respective turn of said second inductance winding, said turns of said first and second inductance windings being disposed so that current flows in said first inductance winding in a direction opposite to the direction in which current flows in said second inductance winding, and said first and second inductance windings extending parallel to each other.
Claim 3
Dependent Claim
53 words
A four-terminal network according to claim 1, wherein said first and second inductance windings are bifilar wound about a common core each winding made of the same electrical material and having the same number of turns, said turns of said first winding being in surface contact with said turns of said second winding.
Claim 4
Dependent Claim
33 words
A four-terminal network according to claim 1, wherein said network consists essentially of said first and second windings and said condenser, said condenser connected directly between said intermediate point and said common point.
Claim 5
Dependent Claim
47 words
A four-terminal network according to claim 1, including a third inductance winding connected between said first input terminal and said one end of said first inductance winding, and a fourth inductance winding connected between said one end of said second inductance winding and said first input terminal.
Claim 6
Dependent Claim
29 words
A four-terminal network according to claim 4, including a second condenser connected in parallel to said third winding and a third condenser connected in parallel to said fourth winding.
Claim 7
Dependent Claim
29 words
A four-terminal network according to claim 5, including a second condenser connected in series with said third winding and a third condenser connected in series with said fourth winding.
Claim 8
Dependent Claim
43 words
A four-terminal network according to claim 1, including a second condenser connected between said one end of said inductance winding and said first input terminal and a third condenser connected between said one end of said second winding and said first output terminal.
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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |