US3720890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide for moisture measurement
Assignee: Rank Cintel Ltd
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Filing: 1971-07-08
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Granted: 1973-03-13
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Expires: 1991-07-08
Abstract
Abstract Waveguide for use in moisture measurement comprises two plates with the propagation channel partly formed in each. Preferably both plates have a series of spaced grooves or slots at preferably both sides of the channel and transverse thereto to reduce longitudinal excitation of electromagnetic waves outside the channel.
Inventors
- 👤 J Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:22
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/30; G; G01; G01N; G01N22/00; G01N22/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A waveguide comprising two plates arranged in face to face relationship with the propagation channel partly formed in each of the opposed faces of the plates and wherein at least one of said opposed faces has slots or grooves which are spaced in the direction of the length of the propagation channel, which are located at at least one side of the propagation channel, and each of which extends in a direction transverse to the direction of the length of the propagation channel but does not penetrate such channel so that said slots act to reduce or eliminate longitudinal excitation of electromagnetic waves outside the prOpagation channel.
Claim 2
Dependent Claim
107 words
A waveguide comprising two plates arranged in face to face relationship with the propagation channel partly formed in each of the opposed faces of the plates and wherein at least one of said opposed faces has slots or grooves which are spaced in the direction of the length of the propagation channel, which are located at at least one side of the propagation channel, and each of which extends in a direction transverse to the direction of the length of the propagation channel but does not penetrate such channel so that said slots act to reduce or eliminate longitudinal excitation of electromagnetic waves outside the prOpagation channel.
Claim 3
Dependent Claim
107 words
A waveguide comprising two plates arranged in face to face relationship with the propagation channel partly formed in each of the opposed faces of the plates and wherein at least one of said opposed faces has slots or grooves which are spaced in the direction of the length of the propagation channel, which are located at at least one side of the propagation channel, and each of which extends in a direction transverse to the direction of the length of the propagation channel but does not penetrate such channel so that said slots act to reduce or eliminate longitudinal excitation of electromagnetic waves outside the prOpagation channel.
Claim 4
Dependent Claim
107 words
A waveguide comprising two plates arranged in face to face relationship with the propagation channel partly formed in each of the opposed faces of the plates and wherein at least one of said opposed faces has slots or grooves which are spaced in the direction of the length of the propagation channel, which are located at at least one side of the propagation channel, and each of which extends in a direction transverse to the direction of the length of the propagation channel but does not penetrate such channel so that said slots act to reduce or eliminate longitudinal excitation of electromagnetic waves outside the prOpagation channel.
Claim 5
Dependent Claim
23 words
A waveguide according to claim 1, wherein there is a series of such slots or grooves at each side of the propagation channel.
Claim 6
Dependent Claim
41 words
A waveguide according to claim 2, wherein each of said slots or grooves is defined by side walls and a curved base and diminishes to zero depth at each end, one end of such base terminating close to the propagation channel.
Claim 7
Dependent Claim
15 words
A waveguide according to claim 3, wherein each waveguide plate has such slots or grooves.
Claim 8
Dependent Claim
32 words
A waveguide according to claim 4, wherein there is at least one choke channel in at least one of the waveguide plates extending transversely of and through the transverse grooves or slots.
Claim 9
Dependent Claim
24 words
A waveguide according to claim 1, wherein there is a dielectric material holding channel extending transversely of, and passing through, the grooves or slots.
References Cited (Backward Citations)
GB844856A
Cited
US3586971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |