Patent US3971041A successfully refreshed from Google Patents.
US3971041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chart recorder using a fixed thermal print head
Assignee: Angus Electronics Co
•
Filing: 1974-11-13
•
Granted: 1976-07-20
•
Expires: 1994-11-13
Abstract
Abstract A chart recorder for graphically displaying data utilizing a strip of heat-sensitive paper and a row of heat-generating dots. The strip of heat-sensitive paper is advanced across the row of heat-generating dots, and the dots are selectively energized in response to data to be displayed by the chart recorder. The position of an energized dot along the row of dots corresponds to a value of data.
Inventors
- 👤 Charles F. Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:19
CPC Classifications
G; G01; G01D; G01D9/00; G01D9/28; G01D9/32; G01D9/34; G01D15/00; G01D15/10; G01D9/285
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A chart recorder for graphically displaying data comprising: a chassis; a print head mounted on the chassis and having a single row of heat-generating dots along a first face, the first face including an array of heat-generating dots adjacent the row of dots, the dimensions of the array of heat-generating dots being significantly less than the length of the row of heat-generating dots; a strip of heat sensitive medium; drive means for advancing the strip of heat sensitive medium across the row of dots and the array of dots, the heat sensitive medium advanced past the print head being marked by dots in the row of heat generating dots to produce graphical representations and by the array of dots to produce a symbolic character.
Claim 2
Dependent Claim
124 words
A chart recorder for graphically displaying data comprising: a chassis; a print head mounted on the chassis and having a single row of heat-generating dots along a first face, the first face including an array of heat-generating dots adjacent the row of dots, the dimensions of the array of heat-generating dots being significantly less than the length of the row of heat-generating dots; a strip of heat sensitive medium; drive means for advancing the strip of heat sensitive medium across the row of dots and the array of dots, the heat sensitive medium advanced past the print head being marked by dots in the row of heat generating dots to produce graphical representations and by the array of dots to produce a symbolic character.
Claim 3
Dependent Claim
34 words
The recorder of claim 1 in which the heat sensitive medium advanced past the row of dots is marked by a small transverse line through one of the graphs corresponding to the symbolic character.
Claim 4
Dependent Claim
19 words
The recorder of claim 1 in which there are about 400 dots in the row of heat generating dots.
References Cited (Backward Citations)
US3081458A
Cited
US3163489A
Cited
US3161457A
Cited
US3453647A
Cited
US3465360A
Cited
US3476877A
Cited
US3644931A
Cited
US3496333A
Cited
US3840878A
Cited
US3754279A
Cited
US3815144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |