Telephone ringer insolator

Claim 2

An isolator for selectively coupling a means to be energized which is coupled to one of a pair of telephone lines to a reference potential in response to an activating signal on the telephone lines, said isolator comprising: a controlled conduction means coupled between said means to be energized and said reference potential, and an isolator means coupled to said telephone lines and to said controlled conduction means, said isolator means controlling said controlled conduction means to connect said means to be energized to said reference potential in response to said isolator means receiving said activating signal on said telephone lines.

Claim 3

An isolator for selectively coupling a means to be energized from one of a pair of telephone lines to a reference potential in response to an activating signal on the telephone lines, said isolator comprising: a controlled conduction means coupled between said means to be energized and said reference potential, an isolator means coupled to said telephone lines and to said controlled conduction means, said isolator means controlling said controlled conduction means to connect said means to be energized to said reference potential in response to said isolator means receiving said activating signal on said telephone lines, and a full wave rectifier coupling said controlled conduction means to said means to be energized and said reference potential.

Claim 4

An isolator for selectively coupling a means to be energized from one of a pair of telephone lines to a reference potential in response to an activating signal on the telephone lines, said isolator comprising: a controlled conduction means coupled between said means to be energized and said reference potential, an isolator means coupled to said telephone lines and to said controlled conduction means, said isolator means controlling said controlled conduction means to connect said means to be energized to said reference potential in response to said isolator means receiving said activating signal on said telephone lines, and a full wave rectifier coupling said controlled conduction means to said means to be energized and said reference potential.

Claim 5

The isolator as set forth in claim 1 wherein said isolator means is a photo coupler means including a breakdown voltage device coupled between said pair of telephone lines and a photo resistor responsive to said breakdown voltage device, said photo resistor being coupled to said controlled conduction means.

Claim 6

The isolator as set forth in claim 1 wherein said isolator means is a breakdown voltage device and a transformer, said breakdown voltage device coupling said transformer across said pair of telephone lines.

Claim 7

The isolator as set forth in claim 1 wherein said controlled conduction means has a control electrode and a pair of output electrodes.

Claim 8

A ringer isolator for selectively coupling a ringer which is coupled to one of a pair of telephone lines to a reference terminal in response to a ringer signal on the telephone lines, said ringer isolator comprising: a light emitting means coupled to said telephone lines and having first and second conduction states in response to said ringer signal, a resistor means responsive to said light emitting means, said resistor means having a first resistance state when said light emitting means is in said first conduction state and a second resistance state when said light emitting means is in a second conduction state, and a controlled conduction means coupled between said ringer and said reference terminal and coupled to said resistor means, said controlled conduction means has first and second controlled conduction states and is responsive to said resistor means by being in said first controlled conduction state when said resistor means is in said first resistance state to disconnect said ringer from said reference terminal and is in said second controlled conduction state when said resistor means is in said second resistance state to connect said ringer to said reference terminal.

Claim 9

A ringer isolator for selectively coupling a ringer which is coupled to one of a pair of telephone lines to a reference terminal in response to a ringer signal on the telephone lines, said ringer isolator comprising: a light emitting means coupled to said telephone lines and having first and second conduction states in response to said ringer signal, a resistor means responsive to said light emitting means, said resistor means having a first resistance state when said light emitting means is in said first conduction state and a second resistance state when said light emitting means is in a second conduction state, and a controlled conduction means coupled between said ringer and said reference terminal and coupled to said resistor means, said controlled conduction means has first and second controlled conduction states and is responsive to said resistor means by being in said first controlled conduction state when said resistor means is in said first resistance state to disconnect said ringer from said reference terminal and is in said second controlled conduction state when said resistor means is in said second resistance state to connect said ringer to said reference terminal.

Claim 10

A ringer isolator for coupling a ringer means to one of a pair of telephone lines and to a reference terminal in response to a ringer signal on said telephone lines, said ringer isolator comprising: a controlled conduction means coupled to said ringer means and to said reference terminal, a light emitting means coupled to said telephone lines, and a variable impedance means having a variable impedance value controlled by said light emitting means, said variable impedance means being coupled to said controlled conduction means such that said variable impedance means controls the conductivity of said controlled conduction means.

Claim 11

A ringer isolator for coupling a ringer means to one of a pair of telephone lines and to a reference terminal in response to a ringer signal on said telephone lines, said ringer isolator comprising: a controlled conduction means coupled to said ringer means and to said reference terminal, a light emitting means coupled to said telephone lines, and a variable impedance means having a variable impedance value controlled by said light emitting means, said variable impedance means being coupled to said controlled conduction means such that said variable impedance means controls the conductivity of said controlled conduction means.

Claim 12

The ringer isolator as set forth in claim 7 wherein said variable impedance means is a photo resistor having a relatively high resistance value when said light emitting means is not emitting light and a relatively low resistance value when said light emitting means is emitting light, said controlled conduction means being maintained nonconductive when said photo resistor is in its relatively high resistance state and is rendered conductive when said photo resistor is in its relatively low resistance state.

Claim 13

The ringer isolator as set forth in claim 7 wherein said controlled conduction means is a silicon controlled rectifier having a pair of output electrodes and a control electrode, said variable impedance means being coupled between said control electrode and one of said output electrodes and said pair of output electrodes being coupled in series relationship between said ringer means and said reference terminal.

Claim 14

An isolator for selectively coupling a means to be energized from one of a pair of telephone lines to a reference terminal in response to an activating signal on the telephone lines, said isolator comprising: a controlled conduction means having a control electrode and a pair of output electrodes, one of said output electrodes being coupled to said means to be energized and the other of said output electrodes being coupled to said reference terminal; and an isolator means coupled between said telephone lines and coupled to said control electrode of said controlled conduction means, said isolator means enabling said controlled conduction means to couple said means to be energized to said reference terminal through said output electrodes whenever said isolator means responses to said activating signal on said telephone lines.

Claim 15

An isolator for selectively coupling a means to be energized from one of a pair of telephone lines to a reference terminal in response to an activating signal on the telephone lines, said isolator comprising: a controlled conduction means having a control electrode and a pair of output electrodes, one of said output electrodes being coupled to said means to be energized and the other of said output electrodes being coupled to said reference terminal; and an isolator means coupled between said telephone lines and coupled to said control electrode of said controlled conduction means, said isolator means enabling said controlled conduction means to couple said means to be energized to said reference terminal through said output electrodes whenever said isolator means responses to said activating signal on said telephone lines.

Claim 16

A ringer isolator for coupling a ringer means to one of a pair of telephone lines and to a reference terminal in response to a ringer signal on said telephone lines, said ringer isolator comprising: a controlled conduction means coupled to said ringer means and to said reference terminal, said controlled conduction means having a control electrode and a pair of output electrodes, a full wave rectifier coupled to said controlled conduction means such that said pair of output electrodes are maintained in series relationship between said ringer means and said reference terminal by said full wave rectifier, a light emitting means coupled to said telephone lines, and a variable impedance means having a variable impedance value controlled by said light emitting means, said variable impedance means being coupled to said controlled conduction means such that said variable impedance means is coupled between one of said output electrodes and said control electrode and controls the conductivity of said controlled conduction means.

Claim 17

A ringer isolator for coupling a ringer means to one of a pair of telephone lines and to a reference terminal in response to a ringer signal on said telephone lines, said ringer isolator comprising: a controlled conduction means coupled to said ringer means and to said reference terminal, said controlled conduction means having a control electrode and a pair of output electrodes, a full wave rectifier coupled to said controlled conduction means such that said pair of output electrodes are maintained in series relationship between said ringer means and said reference terminal by said full wave rectifier, a light emitting means coupled to said telephone lines, and a variable impedance means having a variable impedance value controlled by said light emitting means, said variable impedance means being coupled to said controlled conduction means such that said variable impedance means is coupled between one of said output electrodes and said control electrode and controls the conductivity of said controlled conduction means.

Claim 18

A ringer isolator for coupling a ringer means to one of a pair of telephone lines and to a reference terminal in response to a ringer signal on said telephone lines, said ringer isolator comprising: a controlled conduction means coupled to said ringer means and to said reference terminal, said controlled conduction means is a silicon controlled rectifier having a pair of output electrodes and a control electrode and said pair of output electrodes being coupled in series relationship between said ringer means and said reference terminal, a full wave rectifier means coupling said pair of output electrodes in series relationship between said ringer means and said reference terminals, a light emitting means coupled to said telephone lines, and a variable impedance means having a variable impedance value controlled by said light emitting means, said variable impedance being coupled to said controlled conduction means such that said variable impedance means is coupled between said control electrode and one of said output electrodes and controls the conductivity of said controlled means.

Claim 19

A ringer isolator for coupling a ringer means to one of a pair of telephone lines and to a reference terminal in response to a ringer signal on said telephone lines, said ringer isolator comprising: a controlled conduction means coupled to said ringer means and to said reference terminal, said controlled conduction means is a silicon controlled rectifier having a pair of output electrodes and a control electrode and said pair of output electrodes being coupled in series relationship between said ringer means and said reference terminal, a full wave rectifier means coupling said pair of output electrodes in series relationship between said ringer means and said reference terminals, a light emitting means coupled to said telephone lines, and a variable impedance means having a variable impedance value controlled by said light emitting means, said variable impedance being coupled to said controlled conduction means such that said variable impedance means is coupled between said control electrode and one of said output electrodes and controls the conductivity of said controlled means.

Claim 20

An isolator selectively coupling a means to be energized which is coupled to one of a pair of telephone lines to a reference terminal in response to an activating signal on the telephone line, said isolator comprising: a transformer having a primary winding and a secondary winding, a breakdown voltage device coupling the primary winding of said transformer to said telephone lines, a controlled conduction means coupled between said means to be energized and said reference terminal, said controlled conduction means being coupled to the secondary winding of said transformer such that said controlled conduction means connects said means to be energized to said reference potential in response to said primary winding of said transformer receiving said activating signal on said telephone lines.

Claim 21

An isolator selectively coupling a means to be energized which is coupled to one of a pair of telephone lines to a reference terminal in response to an activating signal on the telephone line, said isolator comprising: a transformer having a primary winding and a secondary winding, a breakdown voltage device coupling the primary winding of said transformer to said telephone lines, a controlled conduction means coupled between said means to be energized and said reference terminal, said controlled conduction means being coupled to the secondary winding of said transformer such that said controlled conduction means connects said means to be energized to said reference potential in response to said primary winding of said transformer receiving said activating signal on said telephone lines.

Claim 22

The isolator as set forth in claim 13 wherein said controlled conduction means has a pair of output electrodes and a control electrode, said control electrode being coupled to said secondary winding of said transformer and one of said output electrodes being coupled to said means to be energized and the other of said output electrodes being coupled to said reference terminal.

Claim 23

The isolator as set forth in claim 13 wherein said breakdown voltage device is a diac.

Claim 24

The isolator as set forth in claim 13 wherein said controlled conduction means is a triac.

Claim 25

The isolator as set forth in claim 13 wherein said controlled conduction means is coupled between said means to be energized and said reference terminal by a full wave rectifier.