Patent US2997540A successfully refreshed from Google Patents.
Patent US3555346A successfully refreshed from Google Patents.
US3555346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum tubes
Assignee: NAT RES DEV
•
Filing: 1968-02-05
•
Granted: 1971-01-12
•
Expires: 1988-02-05
Abstract
Abstract An improvement is made in a known vacuum tube arrangement in which information is stored as a modulated electron stream traveling to and fro through a drift region between reflecting meshes, information retrieval being accomplished by gating pulses applied to one mesh to allow electrons to pass through it. Analysis of the gating mechanism shows that satisfactory highspeed operation requires a short electron transit time through the decelerating field associated with the gating mesh. One practical means of achieving this involves the provision of a high potential electrode between the drift region and the gating mesh.
Inventors
- 👤 James Dwyer Mcgee
- 👤 Robin Wyncliffe Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:33
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; H01J31/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
279 words
A vacuum tube arrangement incorporating: A. a vacuum tube having; a. means, comprising an electron-emissive cathode, for generating an electron stream of variable intensity, b. an output device spaced from the generating means and responsive to electrons from the stream, and c. an intermediate electrode system disposed betweEn the generating means and the output device and including, 1. a tubular electrode disposed so as to be coaxial with a straight electron transmission path extending between the generating means and the output device, 2. a first apertured screen disposed across said path between the generating means and the tubular electrode, and 3. a second apertured screen disposed across said path between the tubular electrode and the output device; B. means for providing a focusing magnetic field extending along said path; C. means for maintaining the tubular electrode at a positive potential with respect to the cathode to provide in said path an elongated drift region along which electrons may travel with substantially uniform velocity; D. means for selectively maintaining the first screen at a positive or negative potential with respect to the cathode; E. means for biassing the second screen negative with respect to the cathode potential to establish a decelerating field for electrons emerging from said drift region in a direction towards the second screen, the potential at any point in the decelerating field relative to the cathode potential being V; and F. means for applying to the second screen positive going gating pulses of magnitude Vp greater than the magnitude of the negative bias on the second screen; the arrangement being characterized by that improvement consisting of so dimensioning said decelerating field that the value of the parameter
Claim 2
Dependent Claim
279 words
A vacuum tube arrangement incorporating: A. a vacuum tube having; a. means, comprising an electron-emissive cathode, for generating an electron stream of variable intensity, b. an output device spaced from the generating means and responsive to electrons from the stream, and c. an intermediate electrode system disposed betweEn the generating means and the output device and including, 1. a tubular electrode disposed so as to be coaxial with a straight electron transmission path extending between the generating means and the output device, 2. a first apertured screen disposed across said path between the generating means and the tubular electrode, and 3. a second apertured screen disposed across said path between the tubular electrode and the output device; B. means for providing a focusing magnetic field extending along said path; C. means for maintaining the tubular electrode at a positive potential with respect to the cathode to provide in said path an elongated drift region along which electrons may travel with substantially uniform velocity; D. means for selectively maintaining the first screen at a positive or negative potential with respect to the cathode; E. means for biassing the second screen negative with respect to the cathode potential to establish a decelerating field for electrons emerging from said drift region in a direction towards the second screen, the potential at any point in the decelerating field relative to the cathode potential being V; and F. means for applying to the second screen positive going gating pulses of magnitude Vp greater than the magnitude of the negative bias on the second screen; the arrangement being characterized by that improvement consisting of so dimensioning said decelerating field that the value of the parameter
Claim 3
Dependent Claim
17 words
a first apertured screen disposed across said path between the generating means and the tubular electrode, and
Claim 4
Dependent Claim
17 words
a first apertured screen disposed across said path between the generating means and the tubular electrode, and
Claim 5
Dependent Claim
55 words
A vacuum tube arrangement according to claim 1, in which said intermediate electrode system further includes a second, relatively short, tubular electrode disposed coaxial with the first-mentioned tubular electrode between the latter and the second screen, the arrangement including means for maintaining the second tubular electrode at a much higher positive potential than the first.
Claim 6
Dependent Claim
178 words
a second apertured screen disposed across said path between the tubular electrode and the output device; B. means for providing a focusing magnetic field extending along said path; C. means for maintaining the tubular electrode at a positive potential with respect to the cathode to provide in said path an elongated drift region along which electrons may travel with substantially uniform velocity; D. means for selectively maintaining the first screen at a positive or negative potential with respect to the cathode; E. means for biassing the second screen negative with respect to the cathode potential to establish a decelerating field for electrons emerging from said drift region in a direction towards the second screen, the potential at any point in the decelerating field relative to the cathode potential being V; and F. means for applying to the second screen positive going gating pulses of magnitude Vp greater than the magnitude of the negative bias on the second screen; the arrangement being characterized by that improvement consisting of so dimensioning said decelerating field that the value of the parameter
Claim 7
Dependent Claim
178 words
a second apertured screen disposed across said path between the tubular electrode and the output device; B. means for providing a focusing magnetic field extending along said path; C. means for maintaining the tubular electrode at a positive potential with respect to the cathode to provide in said path an elongated drift region along which electrons may travel with substantially uniform velocity; D. means for selectively maintaining the first screen at a positive or negative potential with respect to the cathode; E. means for biassing the second screen negative with respect to the cathode potential to establish a decelerating field for electrons emerging from said drift region in a direction towards the second screen, the potential at any point in the decelerating field relative to the cathode potential being V; and F. means for applying to the second screen positive going gating pulses of magnitude Vp greater than the magnitude of the negative bias on the second screen; the arrangement being characterized by that improvement consisting of so dimensioning said decelerating field that the value of the parameter
Claim 8
Dependent Claim
48 words
A vacuum tube arrangement according to claim 2, in which there is disposed across that end of the second tubular electrode nearer to the second screen a metal plate maintained at the same potential as the second tubular electrode and having formed in it a long narrow slot.
Claim 9
Dependent Claim
49 words
A vacuum tube arrangement according to claim 1, in which there is disposed between the tubular electrode and the second apertured screen a further apertured screen spaced by a very small distance from the second apertured screen and maintained at a small negative potential with respect to the cathode.
Claim 10
Dependent Claim
53 words
A vacuum tube arrangement according to claim 1, in which the spacing between the second apertured screen and the adjacent end of the tubular electrode does not exceed one centimeter, there being disposed across this end of the tubular electrode a further apertured screen maintained at the same potential as the tubular electrode.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |