US4520359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current frequency waveform transmitting on D.C. power lines
Assignee: Soken Inc
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Filing: 1982-06-09
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Granted: 1985-05-28
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Expires: 2002-06-09
Abstract
Abstract A frequency transmission system comprises a pulse train generator and a signal converter. The pulse train generator generates a pulse signal of a sufficiently short duration in response to oscillation frequency signals, and the signal converter circuit converts the pulse signal into a current signal and blunts the waveform of the converted signal by a capacitor to transmit through power supply lines.
Inventors
- 👤 Junji Kitagawa
- 👤 Shigeyuki Akita
- 👤 Sotoo Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:52
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/16; G08C19/26; G01; G01F; G01F23/00; G01F23/80; B; B60; B60R; B60R16/00; B60R16/02; B60R16/03; B60R16/0315
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
A frequency transmission system for transmitting a frequency signal, comprising: a d.c. battery; a pair of power supply lines connected to said d.c. battery; an oscillator connected to said battery through said power supply lines for generating a first train of pulse signals having a varying frequency; a pulse generator for generating a second train of pulse signals in synchronism with said first train of pulse signals, each of said second train of pulse signals having a pulse duration shorter than that of each of said first train of pulse signals; a switching element connected across said power supply lines for varying an electric current flowing through said power supply lines in synchronism with said second train of pulses; and a capacitor connected across said power supply lines in parallel relation to said switching element for blunting variations in said electric current.
Claim 2
Dependent Claim
142 words
A frequency transmission system for transmitting a frequency signal, comprising: a d.c. battery; a pair of power supply lines connected to said d.c. battery; an oscillator connected to said battery through said power supply lines for generating a first train of pulse signals having a varying frequency; a pulse generator for generating a second train of pulse signals in synchronism with said first train of pulse signals, each of said second train of pulse signals having a pulse duration shorter than that of each of said first train of pulse signals; a switching element connected across said power supply lines for varying an electric current flowing through said power supply lines in synchronism with said second train of pulses; and a capacitor connected across said power supply lines in parallel relation to said switching element for blunting variations in said electric current.
Claim 3
Dependent Claim
30 words
A system according to claim 1, wherein said pulse generator includes a differentiator circuit for differentiating said first train of pulse signals to produce said second train of pulse signals.
Claim 4
Dependent Claim
43 words
A system according to claim 2, wherein said differentiator circuit comprises a capacitor, first diode and resistor connected in series between said power supply lines, and a second diode connected between the other terminal of said capacitor and said one of said lines.
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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) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |