US4805203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cordless telephone system
Assignee: NEC Corp
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Filing: 1987-04-27
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Granted: 1989-02-14
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Expires: 2007-04-27
Abstract
Abstract A cordless telephone system is provided including a base communication unit and portable communication units. The base communication unit is connected to a number of telephone lines, and has the same number of radio transceivers as the telephone lines. Each of the portable communication units is connected to a respective one of the transceivers of the base communication unit by a cordless communication link. In operation, each of the portable communication units is intermittently rendered operative at a particular timing and a predetermined period which are designated by a first signal. The first signal is produced in the base communication unit, and is based on the number of portable communication units turned ON. The particular timing and predetermined period are changed in response to a second signal which is produced in the base communication unit, and which is based on the number of portable communication units turned ON, and on the number of wireless communication units being used.
Inventors
- 👤 Toshiaki Oda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:23
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/02; H04W52/0209; H04W52/0225; H04W52/0238; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
A cordless telephone system comprising: a base communication unit connected to a plurality of telephone lines and having the same number of radio transceivers as said telephone lines; and portable communication units equal in number to said telephone lines and each being connected to a respective one of said transceivers of said base communication unit by a cordless communication link; each of said portable communication units being intermittently rendered operative at a particular timing and at a predetermined period which are designated by a first signal transmitted from said base communication unit, said first signal being produced in said base communication unit based on the number of portable communication units turned ON, said particular timing and predetermined period being changed in response to a second signal transmitted from said base communication unit, said second signal being produced in said base communication unit based on the number of portable communication units turned ON, and on the number of wireless communication links being used.
Claim 2
Dependent Claim
162 words
A cordless telephone system comprising: a base communication unit connected to a plurality of telephone lines and having the same number of radio transceivers as said telephone lines; and portable communication units equal in number to said telephone lines and each being connected to a respective one of said transceivers of said base communication unit by a cordless communication link; each of said portable communication units being intermittently rendered operative at a particular timing and at a predetermined period which are designated by a first signal transmitted from said base communication unit, said first signal being produced in said base communication unit based on the number of portable communication units turned ON, said particular timing and predetermined period being changed in response to a second signal transmitted from said base communication unit, said second signal being produced in said base communication unit based on the number of portable communication units turned ON, and on the number of wireless communication links being used.
Claim 3
Dependent Claim
50 words
A cordless telephone system as claimed in claim 1, wherein each of the transceivers comprises a transmit section, a receive section, a synthesizer connected to both the transmit section and the receive section, a transmit antenna connected to the transmit section, and a receive antenna connected to the receive section.
Claim 4
Dependent Claim
23 words
A cordless telephone system as claimed in claim 1, further comprising a hybrid switch for switchingly connecting the transceivers to the telephone lines.
Claim 5
Dependent Claim
17 words
A cordless telephone system as claiemd in claim 1, further comprising a controller for controlling the transceivers.
Claim 6
Dependent Claim
71 words
A cordless telephone system as claimed in claim 1, wherein each of the portable communication units comprises a transmit section, a receive section, a synthesizer and a telephone section which are connected to both the transmit section and the receive section, a transmit antenna connected to the transmit section, a receiver antenna connected to the receive section, and a controller for controlling said transmit section, receive section, synthesizer, and telephone section.
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) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |