US4977608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio communication system
Assignee: Kenwood KK
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Filing: 1990-01-02
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Granted: 1990-12-11
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Expires: 2010-01-02
Abstract
Abstract In the radio communication system for performing a communication in the idle channel selected from a plurality of frequency channels, the originating call station transmits the station identification code to specify the distant station together with the idle channel data to be actually communicated, and the distant station designated by the station identification code shifts to the designated idle channel, and the communication is executed between two stations. During communication in a certain channel between two stations, in the case where a radio interference occurs in this channel and it is intended to shift to other channel, one station transmits the other channel data in the communication channel and the other station receives it, and the communication is continued each other in the other channel.
Inventors
- 👤 Kiroyuki Hashimoto
- 👤 Nobuo Iizuka
- 👤 Suzuki Akira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:41
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/06; H04W4/00; H04W4/06; H04W4/10; H04W76/00; H04W76/40; H04W76/45
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
163 words
A transceiver comprising: a register for storing a code of representing a frequency, a transmitter for transmitting a signal at a channel frequency determined by the code set in said register; means in response to a manual operation for generating an instruction signal indicative of a changeover of transmission channel frequency; and control means responsive to a calling instruction for setting a code of representing a start channel frequency in said register so that said transmitter transmits a signal including a shift channel frequency information at the start channel frequency and thereafter for shifting and transmitted into the shift channel frequency to be in a transmission/reception state; wherein said control means responsive to the transmission channel frequency changeover instruction changes over the contents of said register from the code of representing the start channel frequency to the code of representing the shift channel frequency or from the code of representing the shift channel frequency to the code of representing the start channel frequency.
Claim 2
Dependent Claim
163 words
A transceiver comprising: a register for storing a code of representing a frequency, a transmitter for transmitting a signal at a channel frequency determined by the code set in said register; means in response to a manual operation for generating an instruction signal indicative of a changeover of transmission channel frequency; and control means responsive to a calling instruction for setting a code of representing a start channel frequency in said register so that said transmitter transmits a signal including a shift channel frequency information at the start channel frequency and thereafter for shifting and transmitted into the shift channel frequency to be in a transmission/reception state; wherein said control means responsive to the transmission channel frequency changeover instruction changes over the contents of said register from the code of representing the start channel frequency to the code of representing the shift channel frequency or from the code of representing the shift channel frequency to the code of representing the start channel frequency.
Claim 3
Dependent Claim
24 words
A transceiver according to claim 1, wherein said start channel frequency is predetermined and said shift channel frequency is selected among idle channel frequencies.
References Cited (Backward Citations)
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JPS5972829A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |