US5032808A — R.F. choke for CATV system

Claim 1

Independent Claim 111 words

An RF choke that comprises a coil form of a predetermined cross section, a wire coil wound upon said coil form, said coil including a first lead, a second lead, at least two successive windings in series with one another and disposed in series between said first and second leads, each of said windings being wound upon said coil form with a spacing between a last turn of one winding and a first turn of a next adjacent winding, and a loop formed off the coil form connected in series between said two windings to join said last turn of the one winding and said first turn of the next winding.

Claim 2

Dependent Claim 111 words

An RF choke that comprises a coil form of a predetermined cross section, a wire coil wound upon said coil form, said coil including a first lead, a second lead, at least two successive windings in series with one another and disposed in series between said first and second leads, each of said windings being wound upon said coil form with a spacing between a last turn of one winding and a first turn of a next adjacent winding, and a loop formed off the coil form connected in series between said two windings to join said last turn of the one winding and said first turn of the next winding.

Claim 3

Dependent Claim 19 words

An RF choke according to claim 1 further comprising a resistor connected in parallel with one of said windings.

Claim 4

Dependent Claim 19 words

An RF choke according to claim 1 wherein said windings are each formed of respective different numbers of turns.

Claim 5

Dependent Claim 17 words

An RF choke according to claim 1 wherein said coil form includes a core of ferromagnetic material.

Claim 6

Dependent Claim 14 words

An RF choke according to claim 4 wherein said ferromagnetic material includes iron powder.

Claim 7

Dependent Claim 21 words

An RF choke according to claim 1 wherein said at least two successive windings are wound in the same helical direction.

Claim 8

Dependent Claim 146 words

An RF choke that comprises a coil form of a predetermined cross section; a wire coil wound upon the coil form, said coil including a first lead, a first winding of N 1 turns, said first lead being connected to an input side of the first winding, a second winding of N 2 turns, a third winding of N 3 turns, a second lead connected to an output side of said third winding, said first, second and third windings being wound upon said coil form, a first supplementary coil being formed of at least one turn formed off said coil form joining the first and second windings to leave a space on the coil form therebetween, and a second supplementary coil of at least one turn formed off said coil form joining the second and third windings to leave a space on the coil form therebetween.

Claim 9

Dependent Claim 146 words

An RF choke that comprises a coil form of a predetermined cross section; a wire coil wound upon the coil form, said coil including a first lead, a first winding of N 1 turns, said first lead being connected to an input side of the first winding, a second winding of N 2 turns, a third winding of N 3 turns, a second lead connected to an output side of said third winding, said first, second and third windings being wound upon said coil form, a first supplementary coil being formed of at least one turn formed off said coil form joining the first and second windings to leave a space on the coil form therebetween, and a second supplementary coil of at least one turn formed off said coil form joining the second and third windings to leave a space on the coil form therebetween.

Claim 10

Dependent Claim 24 words

The RF choke of claim 7 wherein said first and second supplementary coils each form a loop that does not contain the coil form.

Claim 11

Dependent Claim 19 words

The RF choke of claim 7 wherein said first, second, and third windings all have different numbers of turns.

Claim 12

Dependent Claim 20 words

The RF choke of claim 9, wherein N 1 =5 turns, N 2 =7 turns, and N 3 =4 turns.

Claim 13

Dependent Claim 14 words

The RF choke of claim 7 wherein said coil form includes a ferromagnetic core.

Claim 14

Dependent Claim 17 words

The RF choke of claim 7 further comprising a resistor connected in parallel with said third winding.

Claim 15

Dependent Claim 16 words

The RF choke of claim 12 wherein said resistor is on the order of 750 ohms.

Claim 16

Dependent Claim 37 words

The RF choke of claim 7 wherein said coil includes at least a fourth winding on said coil form in series with said first, second, and third windings and between said third winding and said second lead.

Claim 17

Dependent Claim 15 words

The RF choke of claim 7 wherein said coil form includes a powdered iron core.

Claim 18

Dependent Claim 100 words

An RF choke that comprises a helically wound wire coil including a first lead, a second lad, at least two windings in series with one another and disposed between said first and second leads, each of said windings being wound in a common helix but with a spacing between a last turn of one winding and a first turn of a next adjacent winding, which first turn is the next turn in succession in said common helix, and a loop formed off said helix joining said last turn of said one winding and said first turn of the next winding.

Claim 19

Dependent Claim 100 words

An RF choke that comprises a helically wound wire coil including a first lead, a second lad, at least two windings in series with one another and disposed between said first and second leads, each of said windings being wound in a common helix but with a spacing between a last turn of one winding and a first turn of a next adjacent winding, which first turn is the next turn in succession in said common helix, and a loop formed off said helix joining said last turn of said one winding and said first turn of the next winding.

Claim 20

Dependent Claim 72 words

An RF choke that comprises at least first and second wire coils wound on a common core with a last turn of the first coil being spaced from a first turn of the second coil, and an inductor formed of a wire loop off said core disposed in series between the first and second coils and joining the last turn of the first coil to the first turn of the second coil.

Claim 21

Dependent Claim 72 words

An RF choke that comprises at least first and second wire coils wound on a common core with a last turn of the first coil being spaced from a first turn of the second coil, and an inductor formed of a wire loop off said core disposed in series between the first and second coils and joining the last turn of the first coil to the first turn of the second coil.

Claim 22

Dependent Claim 46 words

The RF choke of claim 17 that also comprises a third wire coil wound on the common core and another inductor formed of a wire loop off said core joining a last turn of the second wire coil with a first turn of the third coil.

Claim 23

Dependent Claim 40 words

The RF choke of claim 17 wherein said wire loop is disposed adjacent a space formed between the last turn of the first coil and the first turn of the second coil and at an axial position of said space.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-07-15	1995-01-14	1995-07-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-07-15	1999-01-14	1999-07-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-07-15	2003-01-14	2003-07-16	$7700.00	Window Closed / Lapsed

R.F. choke for CATV system

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