Patent JPS60194031A successfully refreshed from Google Patents.
US3753158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for retaining gas-filled vial in pre-tr unit
Assignee: Varian Medical Systems Inc
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Filing: 1972-06-29
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Granted: 1973-08-14
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Expires: 1992-06-29
Abstract
Abstract A TR-limiter apparatus includes a pre-TR unit for response to RF energy of a predetermined minimum level. The unit includes a gasfilled vial mounted between a resonant cavity and a slot for coupling RF energy below the predetermined level to the cavity and for reflecting RF energy above the predetermined level. A resiliently biased member urges the gas-filled vial firmly against a retaining surface of a housing to maintain the vial at the inner end of a coupling slot through which the RF energy is supplied. In this manner, the recovery time of the pre-TR unit is minimized and the resonant frequency of the cavity is stabilized despite thermal cycling of the vial and the housing in the operation of the TR-limiter apparatus.
Inventors
- 👤 T Prescott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:40
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/006; G; G01; G01S; G01S7/00; G01S7/02; G01S7/03; G01S7/034
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
Apparatus for limiting the electrical power of a transmitted signal supplied to a receiver, comprising: housing means for defining a cavity, said housing being provided with a first surface and a first aperture intersecting said cavity, said aperture including a retaining surface extending adjacent to said first surface so as to define a wall bounded by said first surface and said retaining surface, said housing means being provided with a slot having an inner end adjacent to said aperture for coupling said transmitted signal to said aperture; gas discharge means received in said aperture in said housing means; means slidably mounted in said housing means and movable into said cavity for engagement with said gas discharge means; and means for urging said slidable means into engagement with said gas discharge means to press said gas discharge means firmly against said retaining surface and adjacent to said inner end of said coupling slot.
Claim 2
Dependent Claim
152 words
Apparatus for limiting the electrical power of a transmitted signal supplied to a receiver, comprising: housing means for defining a cavity, said housing being provided with a first surface and a first aperture intersecting said cavity, said aperture including a retaining surface extending adjacent to said first surface so as to define a wall bounded by said first surface and said retaining surface, said housing means being provided with a slot having an inner end adjacent to said aperture for coupling said transmitted signal to said aperture; gas discharge means received in said aperture in said housing means; means slidably mounted in said housing means and movable into said cavity for engagement with said gas discharge means; and means for urging said slidable means into engagement with said gas discharge means to press said gas discharge means firmly against said retaining surface and adjacent to said inner end of said coupling slot.
Claim 3
Dependent Claim
91 words
The apparatus of claim 1, in which: said gas discharge means is a gas-filled vial, said slidable means is received in a second aperture provided in the housing means on the side of the first aperture opposite to said retaining surface so that said slidable means is effective to press said vial against said retaining surface and said slidable means is provided with a surface having a shape conforming to the shape of the outer surface of said vial for reducing the pressure applied to the outer surface of said vial.
Claim 4
Dependent Claim
72 words
The apparatus of claim 1, in which: said cavity and first and second apertures are mutually perpendicular; and, said gas discharge means is a gas-filled vial; and said slidable means engages one side of said vial for exerting a force on said vial, said force having a component directed toward said coupling slot for maintaining the side of said vial opposite to said one side against said retaining surface of said aperture.
Claim 5
Dependent Claim
153 words
A pre-TR device adapted to limit the power of a signal applied to a receiver, comprising: a housing having a first surface and a cavity, said housing including a slot extending through said surface toward said cavity for coupling a signal having a maximum selected power level to said cavity, said housing being provided with a first aperture extending along said surface and intersecting and extending between both said coupling slot and said cavity; a gas-filled vial received in said aperture for limiting the power level of the signal received by said cavity from said coupling slot to said sElected power level; a member having a first end provided with a shape conforming to the shape of the outer surface of said vial for contacting said vial; and means for resiliently urging said member against said vial to maintain said vial against the wall of said first aperture adjacent to said coupling slot.
Claim 6
Dependent Claim
153 words
A pre-TR device adapted to limit the power of a signal applied to a receiver, comprising: a housing having a first surface and a cavity, said housing including a slot extending through said surface toward said cavity for coupling a signal having a maximum selected power level to said cavity, said housing being provided with a first aperture extending along said surface and intersecting and extending between both said coupling slot and said cavity; a gas-filled vial received in said aperture for limiting the power level of the signal received by said cavity from said coupling slot to said sElected power level; a member having a first end provided with a shape conforming to the shape of the outer surface of said vial for contacting said vial; and means for resiliently urging said member against said vial to maintain said vial against the wall of said first aperture adjacent to said coupling slot.
Claim 7
Dependent Claim
88 words
The apparatus of claim 4, in which: said housing is further provided with a second aperture intersecting said cavity, said member is slidably received in said second aperture for movement into engagement with the outer surface of said vial, and said first end of said member is designed to extend a minimum distance into said cavity and to exert a force on said vial at least a component of which is in the direction of said coupling slot for maintaining said vial against said wall of said aperture.
Claim 8
Dependent Claim
79 words
The apparatus of claim 4, in which: said cavity and said first aperture intersect so that at said intersection said first aperture has a generally semi-circular cross-section, said vial is mounted in said aperture and extends into said cavity at said intersection; and said urging means presses said retaining member into engagement with the portion of the vial that extends into the cavity so that the vial is maintained against said wall of said aperture adjacent said coupling slot.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |