US5233641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio telephone equipment having a sounding device for generating alert tone indicative of response of called subscriber
Assignee: NEC Corp
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Filing: 1992-03-11
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Granted: 1993-08-03
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Expires: 2012-03-11
Abstract
Abstract Radio telephone equipment having a sounding device, a sounding device drive circuit for driving the sounding device, and a control circuit for controlling the sounding device drive circuit. When a person manipulates the equipment to originate a call, the equipment interchanges various control signals with a base station to set up a channel for communication. Then, the base station sends to the equipment a control signal indicative of the fact that the other party has responded to the call. In response, the equipment causes the control circuit to activate the sounding device drive circuit which in turn generates a predetermined alert tone to show the user that a conversation is allowed to be held.
Inventors
- 👤 Koji Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:10
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
107 words
Radio telephone equipment comprising: means for manually generating a dial signal; a sounding device; a sounding device drive circuit for causing said sounding device to generate a predetermined alert tone; and control means for activating said sounding device drive circuit in response to a control signal indicative that a base station has produced a call signal in response to said dial signal, and activating said sounding device drive circuit in response to a call ready signal issued by said base station which is responsive to the called subscriber station going off-hook while the subscriber remains off-hook, and producing a response signal in response to said call signal.
Claim 2
Dependent Claim
107 words
Radio telephone equipment comprising: means for manually generating a dial signal; a sounding device; a sounding device drive circuit for causing said sounding device to generate a predetermined alert tone; and control means for activating said sounding device drive circuit in response to a control signal indicative that a base station has produced a call signal in response to said dial signal, and activating said sounding device drive circuit in response to a call ready signal issued by said base station which is responsive to the called subscriber station going off-hook while the subscriber remains off-hook, and producing a response signal in response to said call signal.
Claim 3
Dependent Claim
34 words
A system as claimed in claim 1, wherein said radio telephone equipment further comprises alert tone stopping means for stopping an operation of said sounding device drive circuit which is driving said sounding device.
Claim 4
Dependent Claim
31 words
A system as claimed in claim 2, wherein a conversation is allowed to be held after said alert tone stopping means has stopped the operation of said sounding device drive circuit.
Claim 5
Dependent Claim
15 words
A system as claimed in claim 1, wherein said sounding device comprises a piezoelectric material.
Claim 6
Dependent Claim
185 words
Radio telephone equipment comprising: a transmit and receive antenna; a transceiver connected to said transmit and receive antenna; data processing means for transmitting and receiving data from a base station via said transmit and receive antenna and said transceiver; a telephone microphone; a telephone receiver; audio signal amplifying means for feeding audio information coming in through said telephone microphone to said transceiver via said data processing means and feeding audio information from another party coming in through said transceiver to said telephone receiver via said data processing means; means for manually generating a dial signal; sounding device means for generating a predetermined alert tone; and control means for controlling said sounding device means to generate the alert tone in response to a control signal indicative that a base station has produced a call signal in response to said dial signal, and activating said sounding device drive circuit in response to a call ready signal issued by said base station which is responsive to the called subscriber station going off-hook while the subscriber remains off-hook, and producing a response signal in response to said call signal.
Claim 7
Dependent Claim
185 words
Radio telephone equipment comprising: a transmit and receive antenna; a transceiver connected to said transmit and receive antenna; data processing means for transmitting and receiving data from a base station via said transmit and receive antenna and said transceiver; a telephone microphone; a telephone receiver; audio signal amplifying means for feeding audio information coming in through said telephone microphone to said transceiver via said data processing means and feeding audio information from another party coming in through said transceiver to said telephone receiver via said data processing means; means for manually generating a dial signal; sounding device means for generating a predetermined alert tone; and control means for controlling said sounding device means to generate the alert tone in response to a control signal indicative that a base station has produced a call signal in response to said dial signal, and activating said sounding device drive circuit in response to a call ready signal issued by said base station which is responsive to the called subscriber station going off-hook while the subscriber remains off-hook, and producing a response signal in response to said call signal.
Claim 8
Dependent Claim
20 words
A system as claimed in claim 5, wherein said radio telephone equipment is bodily received in a handset type casing.
Claim 9
Dependent Claim
18 words
A system as claimed in claim 6, wherein said sounding device means is positioned beside said telephone microphone.
Claim 10
Dependent Claim
24 words
A system as claimed in claim 5, wherein an electroacoustic conversion efficiency of said sounding device means has a peak at a predetermined frequency.
Claim 11
Dependent Claim
101 words
Radio telephone equipment comprising: means for manually generating a dial signal; sound device means for generating a predetermined alert tone; and means for controlling said sound device means to generate said predetermined alert tone in response to a control signal indicative that a base station has produced a call signal in response to said dial signal, and activating said sounding device drive circuit in response to a call ready signal issued by said base station which is responsive to the call subscriber station going off-hook while the subscriber remains off-hook, and producing a response signal in response to said call signal.
Claim 12
Dependent Claim
101 words
Radio telephone equipment comprising: means for manually generating a dial signal; sound device means for generating a predetermined alert tone; and means for controlling said sound device means to generate said predetermined alert tone in response to a control signal indicative that a base station has produced a call signal in response to said dial signal, and activating said sounding device drive circuit in response to a call ready signal issued by said base station which is responsive to the call subscriber station going off-hook while the subscriber remains off-hook, and producing a response signal in response to said call signal.
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) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |