Patent US3786481A successfully refreshed from Google Patents.
US3786481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital television character generator
Assignee: United States Department of the Navy
•
Filing: 1972-04-19
•
Granted: 1974-01-15
•
Expires: 1992-04-19
Abstract
Abstract A means for causing characters such as numbers, letters and the like to appear on a CRT screen by selectively adding various combinations of narrow and wide electronic pulses to the raster scan of the CRT such that the characters are presented on the screen in either black or white, superimposed on any other image presentation.
Inventors
- 👤 G Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/22; G09G5/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
249 words
An apparatus for superimposing symbols on a cathode ray tube display, comprising: a cathode ray tube having a controllable electron beam and means for controlling said electron beam including horizontal and vertical blanking pulse generators; and electronic signal producing means coupled to saiD cathode ray tube for providing an electrical, symbol input signal to said tube in synchronism with the control of said controlling means, including means for generating electronic pulses during the interval between the horizontal blanking pulses of said beam controlling means such that a plurality of consecutive narrow generated pulses forms a vertical image on said cathode ray tube and a plurality of consecutive, relatively wide generated pulses forms a horizontal image on said tube, having decoding means for converting selectable binary coded inputs into at least one of eight possible electrical symbol segments and a digital timing circuit for synchronizing said segments with said control to form at least one preselected symbol on said display, wherein said timing circuit includes triggering means coupled to said beam controlling means for coupling only said blanking pulses to the remainder of said timing circuit, and a first set of a plurality of one-shot multivibrators coupled to said decoding means to form the horizontal and vertical segments of said symbols and a second set of a plurality of one-shot multivibrators coupled to said decoding means to establish the spacing between adjacent symbols; such that the information in said symbol signal is presented for viewing by said cathode ray tube.
Claim 2
Independent Claim
249 words
An apparatus for superimposing symbols on a cathode ray tube display, comprising: a cathode ray tube having a controllable electron beam and means for controlling said electron beam including horizontal and vertical blanking pulse generators; and electronic signal producing means coupled to saiD cathode ray tube for providing an electrical, symbol input signal to said tube in synchronism with the control of said controlling means, including means for generating electronic pulses during the interval between the horizontal blanking pulses of said beam controlling means such that a plurality of consecutive narrow generated pulses forms a vertical image on said cathode ray tube and a plurality of consecutive, relatively wide generated pulses forms a horizontal image on said tube, having decoding means for converting selectable binary coded inputs into at least one of eight possible electrical symbol segments and a digital timing circuit for synchronizing said segments with said control to form at least one preselected symbol on said display, wherein said timing circuit includes triggering means coupled to said beam controlling means for coupling only said blanking pulses to the remainder of said timing circuit, and a first set of a plurality of one-shot multivibrators coupled to said decoding means to form the horizontal and vertical segments of said symbols and a second set of a plurality of one-shot multivibrators coupled to said decoding means to establish the spacing between adjacent symbols; such that the information in said symbol signal is presented for viewing by said cathode ray tube.
Claim 3
Dependent Claim
60 words
The apparatus of claim 1 wherein said pulse generating means produces a first pulse which pulse selectably forms a horizontal image; a second pulse selectably responsive to the first edge of said first pulse, and which forms a vertical image; and, a third pulse selectably responsive to the second edge of said first pulse, and which forms a vertical image.
Claim 4
Dependent Claim
15 words
The apparatus of claim 1 wherein said apparatus presents six characters horizontally on said tube.
Claim 5
Dependent Claim
10 words
The apparatus of claim 3 wherein said characters are numbers.
Claim 6
Dependent Claim
11 words
The apparatus of claim 4 wherein said presentation is in white.
Claim 7
Dependent Claim
11 words
The apparatus of claim 4 wherein said presentation is in black.
Claim 8
Dependent Claim
143 words
The apparatus of claim 1 wherein said first set includes a first and second one-shot multivibrator for each symbol to be presented and the first one-shot for the first symbol is coupled to said triggering means and provides a preselected time delayed output, and the second one shot for the first symbol and the first one-shot for the next symbol are coupled to said time delayed output; and said second set includes means coupled to said triggering means for providing a pulse during the interval between the vertical blanking pulses of said beam controlling means, which pulse is adjustable in time for selecting the vertical position of the symbols on said display, and at least one one-shot multivibrator coupled to said pulse providing means for each symbol to be presented for gating its respective symbol and presenting the selected symbol on said display.
References Cited (Backward Citations)
US3729730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |