US4451853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image data transmission process
Assignee: Fujifilm Business Innovation Corp
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Filing: 1982-02-16
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Granted: 1984-05-29
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Expires: 2002-02-16
Abstract
Abstract The invention relates to an image transmission process such as facsimile transmission wherein image data is converted into an electrical signal, transmitted over lines and then converted into a recorded image at the receiving end. Specifically, the invention concerns a process wherein conventional commercial electric power lines are used as the transmission line, such that facsimile or other image transmission may be easily effected within, for example, a single building or similarly limited area.
Inventors
- 👤 Harukiko Moriguchi
- 👤 Masami Kurata
- 👤 Takashi Ohmori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:27
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00095; H04B; H04B3/00; H04B3/54; H04B3/542; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/5416; H04B2203/5429; H04B2203/5445; H04B2203/5462; H04B2203/5483; H04B2203/5491
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A method for transmitting image information within a building, comprising the steps of: scanning a document to be transmitted and producing a binary signal indicative of image information contained on said document; producing a modulation signal in response to said binary signal, said modulation signal having a frequency of substantially 300 KHz for a first state of said binary signal and a frequency of 400 KHz for a second state of said binary signal; amplifying said modulation signal to a power of 10 mW; low-pass filtering the amplified modulation signal with a cut-off frequency of 450 KHz; coupling the filtered and amplified modulation signal to an electrical power transmission line in said building at a first location; at a second location in said building, coupling said electric power transmission line to a second filter; amplifying an output of said second filter; demodulating the amplified filtered signal received from said electric power transmission line at said second location; and producing a recorded image in response to the demodulated signal.
Claim 2
Independent Claim
168 words
A method for transmitting image information within a building, comprising the steps of: scanning a document to be transmitted and producing a binary signal indicative of image information contained on said document; producing a modulation signal in response to said binary signal, said modulation signal having a frequency of substantially 300 KHz for a first state of said binary signal and a frequency of 400 KHz for a second state of said binary signal; amplifying said modulation signal to a power of 10 mW; low-pass filtering the amplified modulation signal with a cut-off frequency of 450 KHz; coupling the filtered and amplified modulation signal to an electrical power transmission line in said building at a first location; at a second location in said building, coupling said electric power transmission line to a second filter; amplifying an output of said second filter; demodulating the amplified filtered signal received from said electric power transmission line at said second location; and producing a recorded image in response to the demodulated signal.
References Cited (Backward Citations)
US4057793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |