US4647722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Land mobile telephone system
Assignee: Toyoda Gosei Co Ltd
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Filing: 1985-09-27
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Granted: 1987-03-03
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Expires: 2005-09-27
Abstract
Abstract The present invention relates to a land mobile telephone system with enhanced operability realizing both the loud-speech and closed-speech operations by the single handset. The handset is installed detachably in a pad of a steering wheel of an automobile and having a power terminal for feeding electric power from an automobile-equipped battery to said handset devices when said handset is seated in the steering wheel pad, said controller having a speed mode selector which selects a loud-speech mode when said handset is seated in the steering wheel pad or selects a closed-speech mode when said handset is taken out of the steering wheel pad.
Inventors
- 👤 Kouji Nishida
- 👤 Chikahisa Hayashi
- 👤 Makoto Kanai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:45
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/60; H04M1/6033; H04M1/6041; H04M1/6075; H04W; H04W52/00; H04W52/02; H04W52/0209; H04W52/0251; H04W52/0254; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
204 words
A land mobile telephone system comprising: a handset incorporating a microphone, a speaker, an operating unit allowing the selection of a called party for establishing a call, a transceiver implementing transmission and reception of an audio signal and control signal by radio with a relay unit, a controller which receives a signal from said operating unit and issues a control signal depending on the operating state of said operating unit to said relay unit via said transceiver, and a power storage supplying electric power to the above-mentioned devices; and said relay unit connected to a land mobile telephone main unit and adapted to transact the audio signal and control signal with said transceiver and perform radio telephone transmission and reception with a base station, said handset being installed detachably in a pad of a steering wheel of an automobile and having a power terminal for feeding electric power from an automobile-equipped battery to said handset devices when said handset is seated in the steering wheel pad, said controller having a speech mode selector which selects a loud-speech mode when said handset is seated in the steering wheel pad or selects a closed-speech mode when said handset is taken out of the steering wheel pad.
Claim 2
Dependent Claim
204 words
A land mobile telephone system comprising: a handset incorporating a microphone, a speaker, an operating unit allowing the selection of a called party for establishing a call, a transceiver implementing transmission and reception of an audio signal and control signal by radio with a relay unit, a controller which receives a signal from said operating unit and issues a control signal depending on the operating state of said operating unit to said relay unit via said transceiver, and a power storage supplying electric power to the above-mentioned devices; and said relay unit connected to a land mobile telephone main unit and adapted to transact the audio signal and control signal with said transceiver and perform radio telephone transmission and reception with a base station, said handset being installed detachably in a pad of a steering wheel of an automobile and having a power terminal for feeding electric power from an automobile-equipped battery to said handset devices when said handset is seated in the steering wheel pad, said controller having a speech mode selector which selects a loud-speech mode when said handset is seated in the steering wheel pad or selects a closed-speech mode when said handset is taken out of the steering wheel pad.
Claim 3
Dependent Claim
62 words
A land mobile telephone system according to claim 1, wherein said operating unit includes an indicator for displaying an abbreviated telephone number of a called party, and an operating switch for scanning abbreviated telephone numbers on said indicator, said controller being adapted to transmit a telephone number signal corresponding to a selected abbreviated telephone number to said relay unit through said transceiver.
Claim 4
Dependent Claim
67 words
A land mobile telephone system according to claim 1, wherein said operating unit includes an indicator for displaying an abbreviated telephone number of a called party, and an operating switch for scanning abbreviated telephone numbers on said indicator, and said controller includes a memory controller for storing a telephone number corresponding to a selected abbreviated telephone number, and a display controller for displaying the stored telephone number.
Claim 5
Dependent Claim
34 words
A land mobile telephone system according to claim 1, wherein said power supply used when said handset is seated in said steering wheel pad is derived from power lines connected to a horn switch.
Claim 6
Dependent Claim
57 words
A land mobile telephone system according to claim 1, wherein said mode selector operates in the loud-speech mode to switch the speech mode to detect an audio signal in response to a difference of signals detected by said microprocessor equipped in said handset and a second microphone equipped coaxially with said first-mentioned in said steering wheel pad.
References Cited (Backward Citations)
US4307266A
Cited
US4455454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |