Patent US4468539A successfully refreshed from Google Patents.
US4468539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wireless telephone system with intercom signalling and auxiliary station
Assignee: AG Communication Systems Corp
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Filing: 1982-12-16
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Granted: 1984-08-28
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Expires: 2002-12-16
Abstract
Abstract A wireless extension telephone system including a base unit connected to a telephone line and a remote extension unit. Both base and extension units each include a radio receiver and a radio transmitter. Also associated with the base unit is an auxiliary telephone and switch operated intercom signalling means, which when manually operated cause a radio signal to the transmitted to the remote unit for signalling purposes after which conversation may insue between users of the auxiliary telephone and the remote extension unit.
Inventors
- 👤 Edward A. Schober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:43
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/72502
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
153 words
A wireless extension telephone system comprising: an extension unit including a radio receiver and a signal transducer connected to said receiver; a base unit including a signalling circuit and switching means connected to said signalling circuit, manually operated to render said signalling circuit operated, signal generating means, ringing detection means, connected between said signalling circuit and said signal generating means, operated in response to said operated signalling circuit to render said signal generating means operated, a radio transmitter including circuit connections to said ringing detection means, conditioned in response to operation of said ringing detection means, and said radio transmitter connected to said signal generating means, operated in response to said signal generating means to transmit signals received from said signal generating means; and said receiver at said extension unit operated in response to receipt of said signals transmitted from said base unit transmitter to extend said signals to the said signal transducer.
Claim 2
Dependent Claim
153 words
A wireless extension telephone system comprising: an extension unit including a radio receiver and a signal transducer connected to said receiver; a base unit including a signalling circuit and switching means connected to said signalling circuit, manually operated to render said signalling circuit operated, signal generating means, ringing detection means, connected between said signalling circuit and said signal generating means, operated in response to said operated signalling circuit to render said signal generating means operated, a radio transmitter including circuit connections to said ringing detection means, conditioned in response to operation of said ringing detection means, and said radio transmitter connected to said signal generating means, operated in response to said signal generating means to transmit signals received from said signal generating means; and said receiver at said extension unit operated in response to receipt of said signals transmitted from said base unit transmitter to extend said signals to the said signal transducer.
Claim 3
Dependent Claim
40 words
A subscriber's extension telephone system as claimed in claim 1 wherein: the said base unit further includes connections to a telephone line, and said switching means is normally connected to said telephone line thereby connecting base unit to telephone line.
Claim 4
Dependent Claim
45 words
A subscriber's extension telephone system as claimed in claim 2, wherein: there is further included an auxiliary telephone connectable by said switching means to said telephone line; and in response to said switching means being rendered non-operated, connecting said auxiliary telephone to said telephone line.
Claim 5
Dependent Claim
30 words
A subscriber's extension telephone system as claimed in claim 1 wherein: there is further included a source of operating potential, connected to said signalling circuit by said operated switching means.
Claim 6
Dependent Claim
20 words
A subscriber's extension telephone system as claimed in claim 1 wherein: said ring detection means include an optical coupler circuit.
Claim 7
Dependent Claim
44 words
A subscriber's extension telephone system as claimed in claim 1 wherein: said extension unit further includes amplifier means connected between said radio receiver and said signal transducer operated to amplify signals received by said receiver and couple said amplified signals to said signal transducer.
Claim 8
Dependent Claim
27 words
A subscriber's extension telephone system as claimed in claim 1 wherein: said signalling circuit is operated in response to said manual operation to generate a periodic output.
Claim 9
Dependent Claim
30 words
A subscriber's extension telephone system as claimed in claim 7 wherein: said signal generating means comprise a tuned circuit initially operated as a filter and further operated as an oscillator.
Claim 10
Dependent Claim
41 words
A subscriber's extension telephone system as claimed in claim 8 wherein: said base unit further includes a mode control circuit connected to said ring detection means operated to switch said signal generating means from said filter operation to said oscillator operation.
Claim 11
Dependent Claim
48 words
A subscriber's extension telephone system as claimed in claim 9 wherein: said base unit further includes modulator means connected between said signal generating means and said radio transmitter, operated in response to signals from said signal generating means to modulate said transmitter in accordance with said generated signals.
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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |