US3680045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data transmission echoing unit
Assignee: Applied Digital Data Systems Inc
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Filing: 1970-08-18
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Granted: 1972-07-25
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Expires: 1990-08-18
Abstract
Abstract Apparatus for receiving pulse coded signals from a signal source such as an automatic data processing system and for returning the same signals to that source to permit detection and correction of transmission errors. The signals are applied to an input memory device and to the local utilizing device. Once a complete character is in that memory, it is compared with precoded On and Off commands to determine whether it is a control signal for the apparatus. If the apparatus is on, the character is returned to the signal source. If a signal is generated at the local utilizing device, the apparatus switches itself off to prevent confusion of signals, and the apparatus sends the signal source a character indicating it has switched off.
Inventors
- 👤 Reuven Meidan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:18
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
237 words
Apparatus for receiving coded data characters from a data source and transmitting those data characters comprising: an input line adapted for connection to a data source for receipt of data character signals therefrom; storage means connected to said input line for storing received data character signals; a first output line connected to said storage means and adapted for connection to a data utilizing device for transmittal thereto of data character signals after receipt from the data source; comparison means coupled to said storage means and incorporating preset comparison characters for comparing stored data character signals with the preset comparison characters and for generating comparison means output signals when a stored data character signal matches a preset comparison character; a second output line adapted for connection to the data source for transmittal back to the data source of data character signals received therefrom; and switching means coupled to said second output line, to the output of said comparison means, and to said storage means, said switching means in response to a first comparison means output signal assuming a first condition in which data character signals Received from the data source are passed from said storage means to said second output line for transmittal back to the data source and in response to a second comparison means output signal assuming a second condition in which data character signals in said storage means are blocked from said second output line.
Claim 2
Dependent Claim
237 words
Apparatus for receiving coded data characters from a data source and transmitting those data characters comprising: an input line adapted for connection to a data source for receipt of data character signals therefrom; storage means connected to said input line for storing received data character signals; a first output line connected to said storage means and adapted for connection to a data utilizing device for transmittal thereto of data character signals after receipt from the data source; comparison means coupled to said storage means and incorporating preset comparison characters for comparing stored data character signals with the preset comparison characters and for generating comparison means output signals when a stored data character signal matches a preset comparison character; a second output line adapted for connection to the data source for transmittal back to the data source of data character signals received therefrom; and switching means coupled to said second output line, to the output of said comparison means, and to said storage means, said switching means in response to a first comparison means output signal assuming a first condition in which data character signals Received from the data source are passed from said storage means to said second output line for transmittal back to the data source and in response to a second comparison means output signal assuming a second condition in which data character signals in said storage means are blocked from said second output line.
Claim 3
Dependent Claim
55 words
Apparatus a claimed in claim 1 in which said storage means includes a shift register means and in which the apparatus further comprises clock means responsive to receipt of a data character signal for applying to said shift register means sufficient shift pulses to transfer that received data character signal through said shift register means.
Claim 4
Dependent Claim
47 words
Apparatus as claimed in claim 1 further comprising gating means connected to said switching means and adapted for connection to a local data character source for causing said switching means to assume its second condition upon generation of a data character at the local data character source.
Claim 5
Dependent Claim
37 words
Apparatus as claimed in claim 3 further comprising character generating means coupled to said gating means for applying a preset character to said output line upon generation of a data character at the local data character source.
Claim 6
Dependent Claim
52 words
Apparatus as claimed in claim 4 in which said gating means includes delay means responsive to application of the preset character from said character generating means for delaying the assumption of the second condition by said switching means until the preset character has passed through said switching means to said output line.
Claim 7
Dependent Claim
41 words
Apparatus as claimed in claim 1 further comprising a data source connected to said input line for application of data character signals thereto and a data utilizing device connected to said first output line for receipt of data character signals therefrom.
Claim 8
Dependent Claim
17 words
Apparatus as claimed in claim 6 in which the data source is an automatic data processing equipment.
Claim 9
Dependent Claim
14 words
Apparatus as claimed in claim 7 in which the utilizing device is a teleprinter.
Claim 10
Dependent Claim
17 words
Apparatus as claimed in claim 7 in which the automatic data processing equipment is a digital computer.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |