Patent US3681774A successfully refreshed from Google Patents.
US3681774A
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Two-variable strip chart recorder
Assignee: American Optical Corp
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Filing: 1971-01-26
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Granted: 1972-08-01
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Expires: 1991-01-26
Abstract
Abstract A single-pen, two-variable recorder using a heat-sensitive paper and a heated pen. The paper moves at a fixed rate and ordinarily a first continuous signal is recorded. At periodic intervals, samples are taken of a second signal and the pen is used to scribe bars (in the form of a bar graph) with the length of each bar corresponding to the amplitude of a respective sample. While a bar is being recorded, the pen moves relatively fast. This results in lighter lines for the bar graph than for the continuous trace, and allows a fast sampling rate relative to the paper speed without having the bar graph obscure the graticule markings on the paper.
Inventors
- 👤 George J Harris
- 👤 William D Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:17
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/333; A61B5/338; G; G01; G01D; G01D9/00; G01D9/28; G01D9/32; G01D9/34; G01D9/36
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
128 words
A strip chart recorder comprising means for moving continuously a paper strip, pen means normally for recording a trace of a first signal on the moving paper strip, means for periodically sampling a second signal, means operative after the sampling of said second signal for controlling said pen means to record a line of a bar graph the length of which is dependent upon the magnitude of a sample taken previously, and means for causing said pen means to move substantially faster when recording a line of said bar graph than when recording said trace such that the final recording on said paper strip has an intensity for the trace of said first signal which is substantially greater than the intensity of the lines in said bar graph.
Claim 2
Dependent Claim
128 words
A strip chart recorder comprising means for moving continuously a paper strip, pen means normally for recording a trace of a first signal on the moving paper strip, means for periodically sampling a second signal, means operative after the sampling of said second signal for controlling said pen means to record a line of a bar graph the length of which is dependent upon the magnitude of a sample taken previously, and means for causing said pen means to move substantially faster when recording a line of said bar graph than when recording said trace such that the final recording on said paper strip has an intensity for the trace of said first signal which is substantially greater than the intensity of the lines in said bar graph.
Claim 3
Dependent Claim
52 words
A strip chart recorder in accordance with claim 1 wherein said paper is heat-sensitive paper and said pen means includes a heated tip, and further including means for lifting said pen means from said paper both prior to and after the drawing on said paper of any line of said bar graph.
Claim 4
Dependent Claim
71 words
A strip chart recorder in accordance with claim 2 wherein said controlling means causes said pen to be moved to a position on said paper corresponding to one end of any line to be drawn, and thereafter causes said pen to move from said position on said paper to the other end of said line to be drawn on said paper a distance corresponding to the amplidude of the respective sample.
Claim 5
Dependent Claim
61 words
A strip chart recorder in accordance with claim 3 wherein said controlling means includes a capacitor, means for applying a voltage across said capacitor which is dependant upon the amplitude of a sample, and means for controlling the drawing of a line by said pen means of a length which is proportional to the magnitude of the voltage across said capacitor.
Claim 6
Dependent Claim
52 words
A strip chart recorder in accordance with claim 4 further including means for adjusting the base line of said bar graph and the average value of the trace recorded on said paper relative to each other such that the separation and superposition of said trace and said bar graph can be varied.
Claim 7
Dependent Claim
71 words
A strip chart recorder in accordance with claim 5 wherein said paper includes mutually perpendicular graticule markings, said pen means is moved fast enough during the recording of a line such that said graticule markings are readily observable in the region of said bar graph, and the intensity of said trace is great enough such that the drawing of said lines with substantially the same intensity would obscure said graticule markings.
Claim 8
Dependent Claim
52 words
A strip chart recorder in accordance with claim 6 wherein said first siGnal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
Claim 9
Dependent Claim
52 words
A strip chart recorder in accordance with claim 3 wherein said first signal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
Claim 10
Dependent Claim
71 words
A strip chart recorder in accordance with claim 3 wherein said paper includes mutually perpendicular graticule markings, said pen means is moved fast enough during the recording of a line such that said graticule markings are readily observable in the region of said bar graph, and the intensity of said trace is great enough such that the drawing of said lines with substantially the same intensity would obscure said graticule markings.
Claim 11
Dependent Claim
52 words
A strip chart recorder in accordance with claim 3 further including means for adjusting the base line of said bar graph and the average value of the trace recorded on said paper relative to each other such that the separation and superposition of said trace and said bar graph can be varied.
Claim 12
Dependent Claim
71 words
A strip chart recorder in accordance with claim 10 wherein said paper includes mutually perpendicular graticule markings, said pen means is moved fast enough during the recording of a line such that said graticule markings are readily observable in the region of said bar graph, and the intensity of said trace is great enough such that the drawing of said lines with substantially the same intensity would obscure said graticule markings.
Claim 13
Dependent Claim
52 words
A strip chart recorder in accordance with claim 11 wherein said first signal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
Claim 14
Dependent Claim
52 words
A strip chart recorder in accordance with claim 10 wherein said first signal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
Claim 15
Dependent Claim
52 words
A strip chart recorder in accordance with claim 2 further including means for adjusting the base line of said bar graph and the average value of the trace recorded on said paper relative to each other such that the separation and superposition of said trace and said bar graph can be varied.
Claim 16
Dependent Claim
71 words
A strip chart recorder in accordance with claim 14 wherein said paper includes mutually perpendicular graticule markings, said pen means is moved fast enough during the recording of a line such that said graticule markings are readily observable in the region of said bar graph, and the intensity of said trace is great enough such that the drawing of said lines with substantially the same intensity would obscure said graticule markings.
Claim 17
Dependent Claim
52 words
A strip chart recorder in accordance with claim 15 wherein said first signal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
Claim 18
Dependent Claim
52 words
A strip chart recorder in accordance with claim 14 wherein said first signal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
Claim 19
Dependent Claim
71 words
A strip chart recorder in accordance with claim 1 wherein said controlling means causes said pen to be moved to a position on said paper corresponding to one end of any line to be drawn, and thereafter causes said pen to move from said position on said paper to the Other end of said line to be drawn on said paper a distance corresponding to the amplitude of the corresponding sample.
Claim 20
Dependent Claim
61 words
A strip chart recorder in accordance with claim 18 wherein said controlling means includes a capacitor, means for applying a voltage across said capacitor which is dependent upon the amplitude of a sample, and means for controlling the drawing of a line by said pen means of a length which is proportional to the magnitude of the voltage across said capacitor.
Claim 21
Dependent Claim
52 words
A strip chart recorder in accordance with claim 19 further including means for adjusting the base line of said bar graph and the average value of the trace recorded on said paper relative to each other such that the separation and superposition of said trace and said bar graph can be varied.
Claim 22
Dependent Claim
71 words
A strip chart recorder in accordance with claim 20 wherein said paper includes mutually perpendicular graticule markings, said pen means is moved fast enough during the recording of a line such that said graticule markings are readily observable in the region of said bar graph, and the intensity of said trace is great enough such that the drawing of said lines with substantially the same intensity would obscure said graticule markings.
Claim 23
Dependent Claim
52 words
A strip chart recorder in accordance with claim 21 wherein said first signal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
Claim 24
Dependent Claim
52 words
A strip chart recorder in accordance with claim 1 further including means for adjusting the base line of said bar graph and the average value of the trace recorded on said paper relative to each other such that the separation and superposition of said trace and said bar graph can be varied.
Claim 25
Dependent Claim
71 words
A strip chart recorder in accordance with claim 23 wherein said paper includes mutually perpendicular graticule markings, said pen means is moved fast enough during the recording of a line such that said graticule markings are readily observable in the region of said bar graph, and the intensity of said trace is great enough such that the drawing of said lines with substantially the same intensity would obscure said graticule markings.
Claim 26
Dependent Claim
52 words
A strip chart recorder in accordance with claim 24 wherein said first signal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
Claim 27
Dependent Claim
71 words
A strip chart recorder in accordance with claim 1 wherein said paper includes mutually perpendicular graticule markings, said pen means is moved fast enough during the recording of a line such that said graticule markings are readily observable in the region of said bar graph, and the intensity of said trace is great enough such that the drawing of said lines with substantially the same intensity would obscure said graticule markings.
Claim 28
Dependent Claim
52 words
A strip chart recorder in accordance with claim 26 wherein said first signal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
Claim 29
Dependent Claim
52 words
A strip chart recorder in accordance with claim 1 wherein said first signal is derived from the continuous cardiographic monitoring of a patient, and the samples of said second signal are proportional to a count of the number of events of a specified nature which occur between the taking of successive samples.
References Cited (Backward Citations)
US3478364A
Cited
US3573843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |