Patent US3581020A successfully refreshed from Google Patents.
US3581020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ringing tone distribution circuits
Assignee: U S Holding Co Inc
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Filing: 1969-08-22
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Granted: 1971-05-25
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Expires: 1989-08-22
Abstract
Abstract A logic system is provided for supplying ringing tone in successive bursts of one-second duration to each of four bays. The system provides the tone in a repetitive cycle so that the load of only one bay is placed on the source at one time. The system provides a period between each one-second burst to enable relay contacts to be opened and closed in the absence of ringing tone.
Inventors
- 👤 Morris Ribner
- 👤 Alfred M Hestad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:43
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A ringing tone distribution circuit for supplying ringing tone to a plurality of loads comprising first means responsive to a tone request signal for providing reset signals, a pulse source providing a sequence of pulses, means coupled to receive said sequence of pulses and said reset signals and, in response thereto, to provide a plurality of control signals, a source of ringing tone, first switching means responsive to said reset signals and to selected ones of said control signals to connect loads sequentially to the source of ringing tone, and second switching means coupled between the source of ringing tone and contacts of the first switching means, said second switching means responding to selected ones of said control signals for periodically interrupting the ringing tone to said first switching means.
Claim 2
Dependent Claim
130 words
A ringing tone distribution circuit for supplying ringing tone to a plurality of loads comprising first means responsive to a tone request signal for providing reset signals, a pulse source providing a sequence of pulses, means coupled to receive said sequence of pulses and said reset signals and, in response thereto, to provide a plurality of control signals, a source of ringing tone, first switching means responsive to said reset signals and to selected ones of said control signals to connect loads sequentially to the source of ringing tone, and second switching means coupled between the source of ringing tone and contacts of the first switching means, said second switching means responding to selected ones of said control signals for periodically interrupting the ringing tone to said first switching means.
Claim 3
Dependent Claim
28 words
A circuit as claimed in claim 1, in which the means for providing a plurality of control signals includes a divide-by-16 counter and a plurality of gate circuits.
Claim 4
Dependent Claim
33 words
A circuit as claimed in claim 1, in which the first switching means includes counter means and a plurality of gate circuit for connecting the loads sequentially to the source of ringing tone.
Claim 5
Dependent Claim
39 words
A circuit as claimed in claim 1, in which the first switching means includes counter means and a phase control circuit coupled to a plurality of gate circuits for connecting the loads sequentially to the source of ringing tone.
Claim 6
Dependent Claim
41 words
A circuit as claimed in claim 1, in which the first switching means includes a plurality of relays, each of which is operable in sequence to close ''''make'''' contacts and complete connections between the sources of ringing tone and the loads.
Claim 7
Dependent Claim
55 words
A circuit as claimed in claim 1, in which the second switching means includes a gate circuit and a silicon controlled rectifier and said gate circuit is coupled to respond to the selected ones of said control signals by periodically breaking connections over a path through the silicon controlled rectifier and interrupting the ringing tone.
Claim 8
Dependent Claim
67 words
A circuit as claimed in claim 1, in which the first switching means includes counter means and a phase control circuit coupled to a plurality of gate circuits for connecting the loads sequentially to the source of ringing tone, and said first switching means include means for assuring that connections to the load are made only in the absence of ringing tone despite random tone request signals.
References Cited (Backward Citations)
US3223787A
Cited
US3443033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |