Patent US4577138A successfully refreshed from Google Patents.
US4577138A
Expired / Lapsed
US
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Thyratrons
Assignee: Teledyne UK Ltd
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Filing: 1983-07-29
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Granted: 1986-03-18
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Expires: 2003-07-29
Abstract
Abstract Thyratrons have an anode and cathode with a control grid lying between them. A primary grid located between the control grid and cathode may be used to maintain a primary discharge between it and the cathode, and improve the operating characteristics of the thyratron. However, the primary discharge may penetrate into the region where the main discharge occurs and hence increase the probability of premature triggering of the thyratron. By employing the invention, the penetration of the primary discharge into the main discharge region is reduced. A primary grid comprises two elements which have apertures. The elements are arranged so that the apertures in one element do not overlap those in the other. Thus the primary discharge which penetrates through the first element is prevented from reaching the main discharge region by the second element.
Inventors
- 👤 Hugh Menown
- 👤 Raymond P. Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:13
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/50; H01J17/52; H01J17/54; H01J17/56; H01J17/02; H01J17/04; H01J17/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
A gas-filled thyratron comprising an anode; a cathode; a control grid positioned between said anode and said cathode; and a primary grid positioned between said control grid and said cathode, said primary grid having apertures spaced in a direction from cathode to anode in at least two planes, at least one aperture in one plane being staggered relative to at least one aperture in another plane whereby to inhibit penetration through said primary grid of the primary discharge maintained between said primary grid and said cathode prior to triggering, said grids initiating but not limiting the anode current.
Claim 2
Dependent Claim
98 words
A gas-filled thyratron comprising an anode; a cathode; a control grid positioned between said anode and said cathode; and a primary grid positioned between said control grid and said cathode, said primary grid having apertures spaced in a direction from cathode to anode in at least two planes, at least one aperture in one plane being staggered relative to at least one aperture in another plane whereby to inhibit penetration through said primary grid of the primary discharge maintained between said primary grid and said cathode prior to triggering, said grids initiating but not limiting the anode current.
Claim 3
Dependent Claim
96 words
A gas-filled thyratron comprising an anode; cathode; a control grid positioned between said anode and said cathode; and a primary grid positioned between said control grid and said cathode, said primary grid being a multiple layer construction comprising at least two spaced apertured electrodes of which at least one aperture in one electrode is staggered relative to at least one aperture in another electrode whereby to inhibit penetration through said primary grid of the primary discharge maintained between said primary grid and said cathode prior to triggering, said grids initiating but not limiting the anode current.
Claim 4
Dependent Claim
96 words
A gas-filled thyratron comprising an anode; cathode; a control grid positioned between said anode and said cathode; and a primary grid positioned between said control grid and said cathode, said primary grid being a multiple layer construction comprising at least two spaced apertured electrodes of which at least one aperture in one electrode is staggered relative to at least one aperture in another electrode whereby to inhibit penetration through said primary grid of the primary discharge maintained between said primary grid and said cathode prior to triggering, said grids initiating but not limiting the anode current.
Claim 5
Dependent Claim
19 words
A thyratron as claimed in claim 2 and wherein each spaced apertured electrode has a plurality of apertures therein.
Claim 6
Dependent Claim
17 words
A thyratron as claimed in claim 3 and wherein each spaced apertured electrode has two apertures therein.
Claim 7
Dependent Claim
31 words
A thyratron as claimed in claim 3 and wherein all the apertures in one spaced apertured electrode are staggered relative to all of the apertures in the other spaced apertured electrode.
Claim 8
Dependent Claim
44 words
A thyratron as claimed in claim 2 and wherein the extent to which an aperture in one spaced apertured electrode is staggered relative to an aperture in another spaced apertured electrode is such that the first mentioned aperture is not overlapped by the other.
Claim 9
Dependent Claim
43 words
A thyratron as claimed in claim 3 and wherein each apertured electrode has a pair of co-axial arcuate slots therein, the smaller diameter in the case of one pair of slots being greater than the larger diameter of the other pair of slots.
Claim 10
Dependent Claim
26 words
A thyratron as claimed in claim 7 and wherein the said one pair of slots is in that apertured electrode which is nearer to the cathode.
Claim 11
Dependent Claim
26 words
A thyratron as claimed in claim 7 and wherein the said one pair of slots is in that apertured electrode which is further from the cathode.
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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |