US3875348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Common audible signaling circuit
Assignee: AG Communication Systems Corp
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Filing: 1973-10-23
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Granted: 1975-04-01
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Expires: 1993-10-23
Abstract
Abstract An improved signaling circuit for use in telephone subsets, which provides an audible tone signal in response to incoming high voltage ringing signals appearing on any one or more of a multiplicity of telephone lines. The circuitry provides a timed burst of tone which is adjustable in volume and frequency. The volume, frequency and duration of the audible signal are independent of normal variations of the amplitude and frequency of the incoming ringing signal.
Inventors
- 👤 Thomas J Kopec
- 👤 Richard A Morstadt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:43
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
Common audible signaling means for indicating the presence of incoming ringing signals on at least one of a plurality of associated communication lines, said means comprising: a plurality of detectors each including, a light emitting source connected to a different one of said communication lines and operated in response to the presence of ringing signals on said connected line, switching means, and voltage divider means connected across a voltage source including a circuit connection to said switching means and a two legs, one of said legs including fixed resistive elements and the other of said legs including light sensitive element operated in response to light from said light emitting source, and a center tap connected to the input of said switching means; a source of audible signals; gating means connected between said audible signal source and to the output of each of said detector switching means, operated in response to operation of at least one of said switching means to operate said signal source; and a signal transducer connected to said signal source operated in response to said operated signal source to audibly reproduce signals from said source.
Claim 2
Dependent Claim
188 words
Common audible signaling means for indicating the presence of incoming ringing signals on at least one of a plurality of associated communication lines, said means comprising: a plurality of detectors each including, a light emitting source connected to a different one of said communication lines and operated in response to the presence of ringing signals on said connected line, switching means, and voltage divider means connected across a voltage source including a circuit connection to said switching means and a two legs, one of said legs including fixed resistive elements and the other of said legs including light sensitive element operated in response to light from said light emitting source, and a center tap connected to the input of said switching means; a source of audible signals; gating means connected between said audible signal source and to the output of each of said detector switching means, operated in response to operation of at least one of said switching means to operate said signal source; and a signal transducer connected to said signal source operated in response to said operated signal source to audibly reproduce signals from said source.
Claim 3
Dependent Claim
38 words
Common audible signaling means as claimed in claim 1 wherein: there is further included timing means connected between said gating means and said signal source operated in response to said gating means to periodically enable said signal source.
Claim 4
Dependent Claim
45 words
Common audible signaling means as claimed in claim 1 wherein: there is further included amplifier means connected between said signal source and said transducer operated to amplify signals from said signal source and connect said amplified signals to said transducer for reproduction by said transducer.
Claim 5
Dependent Claim
39 words
Common audible signaling means as claimed in claim 1 wherein: said audible signal source further includes a plurality of signal frequency selection means, one of which is selectively operated to determine the frequency of signals from said signal source.
Claim 6
Dependent Claim
28 words
Common audible signaling means as claimed in claim 1 wherein: said light emitting source comprises a neon lamp and said light sensitive element comprises a photo sensitive resistor.
Claim 7
Dependent Claim
19 words
Common audible signaling means as claimed in claim 1 wherein: said light sensitive element comprises a photo sensitive resistor.
References Cited (Backward Citations)
US3406262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |