US3603740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for ringing a telephone subset
Assignee: Nortel Networks Ltd
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Filing: 1969-08-18
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Granted: 1971-09-07
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Expires: 1989-08-18
Abstract
Abstract A gate in the power circuit to the ringing device of a telephone subset is connected to the line from central office and is designed to be opened by signals within a predetermined frequency range appearing on said line.
Inventors
- 👤 Ronan Malcolm Cambridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:59
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A method of controlling ringing in a telephone subset, connected to a telephone office by a line and provided with means for emitting an audible signal on receipt of ringing power originating with said telephone office, comprising the steps of: maintaining ringing power on the said line; preventing the application of ringing power to the said audible signal-producing means in the absence on said line of a signal within a predetermined frequency range which range does not include the frequency of said ringing power; applying to said line during the interval when it is desired to ring said subscriber''s subset, in addition to said ringing power, a signal within said predetermined frequency range.
Claim 2
Independent Claim
113 words
A method of controlling ringing in a telephone subset, connected to a telephone office by a line and provided with means for emitting an audible signal on receipt of ringing power originating with said telephone office, comprising the steps of: maintaining ringing power on the said line; preventing the application of ringing power to the said audible signal-producing means in the absence on said line of a signal within a predetermined frequency range which range does not include the frequency of said ringing power; applying to said line during the interval when it is desired to ring said subscriber''s subset, in addition to said ringing power, a signal within said predetermined frequency range.
Claim 3
Dependent Claim
142 words
Means for controlling the ringing of a subscriber''s subset connected to central office by a line, comprising: means associated with said subset, responsive to ringing power on said line of predetermined frequency to produce an audible tone in the vicinity of said subset, gating means located between said line and said audible tone producing means operable, in the absence of a control signal, to prevent application of ringing power originating with said line to said audible tone producing means a device associated with said subset designed and connected, responsive to the presence on said line of a signal, within a predetermined frequency range not including the frequency of said ringing power to produce said control signal and to supply it to said grating means to cause said gating means to allow ringing power through said gate to said audible tone producing means.
Claim 4
Dependent Claim
142 words
Means for controlling the ringing of a subscriber''s subset connected to central office by a line, comprising: means associated with said subset, responsive to ringing power on said line of predetermined frequency to produce an audible tone in the vicinity of said subset, gating means located between said line and said audible tone producing means operable, in the absence of a control signal, to prevent application of ringing power originating with said line to said audible tone producing means a device associated with said subset designed and connected, responsive to the presence on said line of a signal, within a predetermined frequency range not including the frequency of said ringing power to produce said control signal and to supply it to said grating means to cause said gating means to allow ringing power through said gate to said audible tone producing means.
Claim 5
Dependent Claim
60 words
A device as claimed in claim 2 wherein said frequency range responsive device comprises an amplifier having its input connected to said line, said amplifier having a frequency selective feedback circuit designed and constructed to cause said amplifier to act as a frequency selective filter, and wherein the output of said amplifier is connected to control the said gating means.
Claim 6
Dependent Claim
88 words
The method as claimed in claim 1 including the steps of amplifying signals appearing on said line and feeding back from the output of said amplifier said amplified signals for reamplification, providing frequency selective filtering to said fed back signal to such a manner that the output of said amplifier produces a control signal conditional on the presence on said line of a signal within said predetermined frequency range, and using said control signal to allow the application of ringing power to the said audible signal producing means.
Claim 7
Independent Claim
105 words
The method of selective ringing of subscriber''s subsets, wherein said subsets are connected by a line to a central office, wherein said subsets are provided with means for producing an audible signal, on receipt of ringing power of predetermined frequency continuously applying said ringing power to the subscriber''s line, normally preventing application of said ringing power to said audible signal-producing means selectively applying to said line, in addition to said ringing power a signal within a predetermined frequency range in response to the presence of said signal of predetermined frequency on said line, permitting the application of said ringing power to said audible signal-producing means.
Claim 8
Independent Claim
105 words
The method of selective ringing of subscriber''s subsets, wherein said subsets are connected by a line to a central office, wherein said subsets are provided with means for producing an audible signal, on receipt of ringing power of predetermined frequency continuously applying said ringing power to the subscriber''s line, normally preventing application of said ringing power to said audible signal-producing means selectively applying to said line, in addition to said ringing power a signal within a predetermined frequency range in response to the presence of said signal of predetermined frequency on said line, permitting the application of said ringing power to said audible signal-producing means.
Claim 9
Independent Claim
112 words
A method of controlling ringing in a telephone subset, connected to a telephone office by a line and provided with means for emitting an audible signal on receipt of ringing power from said telephone office, comprising the steps of: maintaining ringing power on the said line; preventing the application of ringing power to the said audible signal-producing means in the absence on said line of at least two simultaneously present signals, each within different predetermined frequency ranges, none of which ranges include the frequency of said ringing power, applying to said line, during the interval when it is desired to ring said subscriber''s phone simultaneous signals respectively within said predetermined frequency ranges.
Claim 10
Independent Claim
112 words
A method of controlling ringing in a telephone subset, connected to a telephone office by a line and provided with means for emitting an audible signal on receipt of ringing power from said telephone office, comprising the steps of: maintaining ringing power on the said line; preventing the application of ringing power to the said audible signal-producing means in the absence on said line of at least two simultaneously present signals, each within different predetermined frequency ranges, none of which ranges include the frequency of said ringing power, applying to said line, during the interval when it is desired to ring said subscriber''s phone simultaneous signals respectively within said predetermined frequency ranges.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |