Patent US4531240A successfully refreshed from Google Patents.
US4531240A
Expired / Lapsed
US
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Data communication system
Assignee: Canon Inc
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Filing: 1982-09-29
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Granted: 1985-07-23
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Expires: 2002-09-29
Abstract
Abstract An improved image forming apparatus for data communication system which makes it possible to keep on signal transmission by changing signal transmission path in relation to the operating conditions of the apparatus. The apparatus is constructed with an image signal processor, an input/output unit for governing input and output of signals between the image signal processing device and signal transmission path, first power source for supplying electric power to drive the image signal processor and the input/output unit, and second power source for supplying electric power to the input/output unit when the first power source is not in operation.
Inventors
- 👤 Yoshikazu Yokomizo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:04
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/02; H04L12/10; H04B; H04B10/00; H04B10/80; H04B10/806; H04B10/808; H04L12/28; H04L12/42; H04L12/437
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
An apparatus constituting a part of a communication system, said apparatus comprising: an electrically powered input unit for receiving signals from a first signal transmission path; an electrically powered output unit for sending signals to a second signal transmission path; an electrically powered signal processing unit for receiving signals from said input unit, for processing the signals and for delivering the processed signals to said output unit; power supply means for supplying electric power to said input unit, said output unit and said signal processing unit so as to drive said units; transmission means adapted to directly transmit the signals received by said input unit to said output unit, when said signal processing unit is not in an operable condition; and an input line for taking in electrical power from power supply means of other similar apparatus constituting a part of said communication system, wherein when said signal processing unit is not in an operable condition, said input unit and said output unit are driven with electric power taken in through said input line so as to permit said transmission means to directly transmit the signals received by said input unit to said output unit.
Claim 2
Independent Claim
195 words
An apparatus constituting a part of a communication system, said apparatus comprising: an electrically powered input unit for receiving signals from a first signal transmission path; an electrically powered output unit for sending signals to a second signal transmission path; an electrically powered signal processing unit for receiving signals from said input unit, for processing the signals and for delivering the processed signals to said output unit; power supply means for supplying electric power to said input unit, said output unit and said signal processing unit so as to drive said units; transmission means adapted to directly transmit the signals received by said input unit to said output unit, when said signal processing unit is not in an operable condition; and an input line for taking in electrical power from power supply means of other similar apparatus constituting a part of said communication system, wherein when said signal processing unit is not in an operable condition, said input unit and said output unit are driven with electric power taken in through said input line so as to permit said transmission means to directly transmit the signals received by said input unit to said output unit.
Claim 3
Dependent Claim
40 words
A communication system comprising a plurality of apparatuses each as defined in claim 1, wherein when at least one of said apparatuses is operable, the others of said apparatuses are driven with power from the operable ones of said apparatuses.
Claim 4
Dependent Claim
23 words
An apparatus according to claim 1, wherein when said signal processing unit is in operable condition, said transmission means is inhibited from operating.
Claim 5
Dependent Claim
50 words
An apparatus according to claim 1, wherein each of said first and second signal transmission paths is a light transmission path, said input unit has a photo-to-electric converter which converts light signals into electric signals, and said output unit has an electric-to-photo converter which converts electric signals to light signals.
Claim 6
Dependent Claim
36 words
A communication system comprising a plurality of apparatuses each as defined in claim 1, wherein said plurality of apparatuses are linked together in a loop configuration by means of said first and second signal transmission paths.
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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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |