Patent US3965307A successfully refreshed from Google Patents.
US3965307A
Expired / Lapsed
US
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Electronic tone ringer
Assignee: AG Communication Systems Corp
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Filing: 1974-05-28
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Granted: 1976-06-22
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Expires: 1994-05-28
Abstract
Abstract An electronic tone ringer for use in telephone subsets. Operating in response to and powered from incoming received ringing signals, the ringer circuitry provides audible multitone signals. The circuitry employed eliminates so-called "bell tapping" or "chirping" during dialing.
Inventors
- 👤 Robert P. Dimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:51
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
258 words
A tone ringer for use in a telephone subset connected to a telephone line, comprising: a rectifier circuit connected to said telephone line, operated in response to ringing signals received over said telephone line, to convert said ringing signals to DC potential; a first oscillator circuit including a plurality of frequency determining components operated to generate tone signals at a first frequency; a second oscillator circuit operated to periodically shunt at least one of said plurality of frequency determining components in said first oscillator; a threshold detector including a capacitor charged in response to at least a predetermined value of said DC potential to permit operation of said oscillators, connected between said rectifier and said first and second oscillator; operated in response to said DC potential from said rectifier being less than a predetermined value to inhibit operation of said oscillators and further operated in response to said DC potential from said rectifier being greater than said predetermined value to render said oscillators operated; said first oscillator further operated in response to each shunting of at least one of said frequency determining components, to generate a tone at a second frequency; a transducer connected to said first oscillator operated in response to generation by said first oscillator of tones of said first and second frequencies to audibly reproduce said tones; and party line determining means connected to ground and between said telephone line and said threshold detector whereby said threshold detector is rendered operable only in response to ringing current received over one side of said telephone line.
Claim 2
Dependent Claim
258 words
A tone ringer for use in a telephone subset connected to a telephone line, comprising: a rectifier circuit connected to said telephone line, operated in response to ringing signals received over said telephone line, to convert said ringing signals to DC potential; a first oscillator circuit including a plurality of frequency determining components operated to generate tone signals at a first frequency; a second oscillator circuit operated to periodically shunt at least one of said plurality of frequency determining components in said first oscillator; a threshold detector including a capacitor charged in response to at least a predetermined value of said DC potential to permit operation of said oscillators, connected between said rectifier and said first and second oscillator; operated in response to said DC potential from said rectifier being less than a predetermined value to inhibit operation of said oscillators and further operated in response to said DC potential from said rectifier being greater than said predetermined value to render said oscillators operated; said first oscillator further operated in response to each shunting of at least one of said frequency determining components, to generate a tone at a second frequency; a transducer connected to said first oscillator operated in response to generation by said first oscillator of tones of said first and second frequencies to audibly reproduce said tones; and party line determining means connected to ground and between said telephone line and said threshold detector whereby said threshold detector is rendered operable only in response to ringing current received over one side of said telephone line.
Claim 3
Dependent Claim
38 words
A tone ringer as claimed in claim 1 wherein: said first oscillator includes a circuit connection to said transducer and in response to ringing signals received over said telephone line provides a DC operating potential to said transducer.
Claim 4
Dependent Claim
36 words
A tone ringer as claimed in claim 1 wherein: there is further included a regulator circuit connected to said rectifier circuit said regulator operated to maintain the magnitude of said DC potential at a constant level.
Claim 5
Dependent Claim
69 words
A tone ringer as claimed in claim 3 wherein: there is further included an amplifier circuit connected between said first oscillator and said transducer, operated to amplify said tones of said first and second frequencies; and said transducer is connected to said regulator, and in response to said constant magnitude DC potential said amplifier and transducer are operated to amplify and reproduce said signals at a constant maximum amplitude.
Claim 6
Dependent Claim
113 words
A tone ringer as claimed in claim 1 wherein: said party line detecting means comprise a first circuit connection to a first side of said telephone line; a second connection to a second side of said telephone line; and switching means connected between said circuit connections and ground; said party line detecting means operated to conduct potential from one side of said telephone line directly to said threshold means in response to ringing current being connected between a first side of said telephone line and ground; and further operate to inhibit conduction of a signal in response to said telephone signal being applied between ground and the second side of said telephone line.
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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |