US4507646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio communication system
Assignee: PS PAGING SYSTEM AB
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Filing: 1982-11-12
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Granted: 1985-03-26
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Expires: 2002-11-12
Abstract
Abstract A paging system for use in a limited area such as an office, a factory building, a hotel, or other public building wherein the existing electrical supply network is used as the antenna of either the transmitter or the receiver. The electrical supply network is capacitively coupled to the transmitter in the preferred embodiment and in addition supplies power to the unit.
Inventors
- 👤 Inge Hamlin
- 👤 Andre Beudat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:10
CPC Classifications
H; H04; H04B; H04B5/00; H04B5/40; H04B5/48; H01; H01Q; H01Q1/00; H01Q1/44; H01Q1/46; H04B3/00; H04B3/54; H04B3/56; H04B5/20; H04B5/22; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/5416; H04B2203/5425; H04B2203/5429; H04B2203/5441; H04B2203/5445; H04B2203/545; H04B2203/5458; H04B2203/5462; H04B2203/5483
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A paging system for a structure having a common AC power network comprising: a transmitting unit including: an oscillator for providing a radio frequency carrier wave; a modulator for applying an information signal to said carrier wave; a power amplifier for amplifying the signal modulated carrier wave; a power supply for providing operating current to said transmitting unit from said AC power network; connect/disconnect means for coupling said power amplifier output signal and said power supply means to said AC power network whereby said network radiates said coupled output signal through said structure; and at least one receiving unit having an antenna and demodulating circuit for receiving and demodulating said radiated signal.
Claim 2
Dependent Claim
112 words
A paging system for a structure having a common AC power network comprising: a transmitting unit including: an oscillator for providing a radio frequency carrier wave; a modulator for applying an information signal to said carrier wave; a power amplifier for amplifying the signal modulated carrier wave; a power supply for providing operating current to said transmitting unit from said AC power network; connect/disconnect means for coupling said power amplifier output signal and said power supply means to said AC power network whereby said network radiates said coupled output signal through said structure; and at least one receiving unit having an antenna and demodulating circuit for receiving and demodulating said radiated signal.
Claim 3
Dependent Claim
28 words
The paging system of claim 1 comprising switching means for enabling said transmitting unit when said power amplifier output signal is effectively coupled to said AC power network.
Claim 4
Dependent Claim
18 words
A paging system according to claim 1 wherein said connect/disconnect means comprises a single plug and socket combination.
Claim 5
Dependent Claim
20 words
The paging system of claim 1 wherein said power amplifier output signal is capacitively coupled to said AC power network.
Claim 6
Dependent Claim
17 words
The paging system of claim 1 including a microphone for supplying said information signal to said modulator.
Claim 7
Independent Claim
31 words
A method as defined in claims 1 or 2, wherein one or more phase wires of said AC power network receive said amplifier output signal and are used as an antenna.
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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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |