Patent US3883798A successfully refreshed from Google Patents.
US3883798A
Expired / Lapsed
US
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Free flow resonant cavity measuring apparatus
Assignee: F Hoffmann La Roche AG
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Filing: 1974-04-19
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Granted: 1975-05-13
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Expires: 1994-04-19
Abstract
Abstract A system adapted for monitoring and/or processing a continuous flowing medium by the use of microwave techniques comprising a rectangular wave guide arrangement including a resonant cavity with end pipe units, one at each end of the resonant cavity and turned 90* with respect to the axis of the resonant cavity so as to be cross-polarized. This in-effect defines a common feed path through which the medium is continuously fed. A feed system is designed to provide a uniform movement of the medium through the resonant cavity to ensure that the resonant cavity is continuously maintained at full capacity for providing uniformity in measurement.
Inventors
- 👤 John Marshall Free
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:20
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; G; G01; G01N; G01N22/00; G01R; G01R27/00; G01R27/02; G01R27/04; H05B6/66; H05B6/68; H05B2206/00; H05B2206/04; H05B2206/045
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A system in which microwave techniques are applied to a solid particulate medium having continuous flow in the system for exposing the medium to resonant electromagnetic energy comprising: wave guide means for defining a substantially uniformed crosssectioned continuous feed path including resonant cavity means and end pipe means at opposite ends of the resonant cavity means, each end pipe means being arranged relative to said resonant cavity means to electrically close one end of the resonant cavity means while maintaining said feed path mechanically unobstructed; and means coupled with said end pipe means for continuously maintaining said resonant cavity means filled with said medium.
Claim 2
Independent Claim
104 words
A system in which microwave techniques are applied to a solid particulate medium having continuous flow in the system for exposing the medium to resonant electromagnetic energy comprising: wave guide means for defining a substantially uniformed crosssectioned continuous feed path including resonant cavity means and end pipe means at opposite ends of the resonant cavity means, each end pipe means being arranged relative to said resonant cavity means to electrically close one end of the resonant cavity means while maintaining said feed path mechanically unobstructed; and means coupled with said end pipe means for continuously maintaining said resonant cavity means filled with said medium.
Claim 3
Dependent Claim
35 words
A system according to claim 1 for measuring the medium for a particular characteristic including means for deriving from the resonant cavity means, an electrical resonance signal representative of the medium characteristic to be monitored.
Claim 4
Dependent Claim
23 words
A system according to claim 2 where the bandwidth of said electrical resonance signal is determinative of the medium characteristic to be measured.
Claim 5
Dependent Claim
44 words
A system according to claim 2 where said deriving means includes means for periodically sweeping said resonant cavity means and including: means for ascertaining the position of said electrical resonance signal relative to each periodic sweep for determining the medium characteristic to be measured.
Claim 6
Dependent Claim
38 words
A system according to claim 2 wherein said resonant cavity means and end pipe means are rectangular wave guides having similar cross-section dimensions and said end pipe means being turned 90* with relation to said resonant cavity means.
Claim 7
Dependent Claim
49 words
A system according to claim 5 including elongated rectangular slab means inserted at opposite sides of said resonant cavity means and at least one of said end pipe means to provide a continuous uninterrupted feed path of uniform cross-section through said resonant cavity means and said end pipe means.
Claim 8
Dependent Claim
55 words
A system according to claim 2 where said means for continuously maintaining said resonant cavity means filled with said medium comprises: feed means for continuously introducing said medium and dispensing from said resonant cavity means so as to maintain a uniform quantity of the medium within the resonant cavity means as the medium moves through.
Claim 9
Dependent Claim
33 words
A system according to claim 2 where the medium includes two or more components of different dielectric constants and it is desired to measure the weight at least of one of said components.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |