US3628135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cranked hollow waveguide for measuring moisture content of moving sheet or web material
Assignee: Rank Cintel Ltd
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Filing: 1969-12-15
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Granted: 1971-12-14
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Expires: 1989-12-15
Abstract
Abstract The invention is concerned with the measurement of moisture content by microwave transmission through a sheet or web of material and the specification discloses a split form of waveguide to embrace the sheet, the waveguide having a cranked configuration portion at one or both ends allowing the edge regions of the sheet to be excluded from the measurement region. The split portions of the waveguide are displaceable away from each other to allow an obstruction to pass between them.
Inventors
- 👤 William Charles Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:44
CPC Classifications
G; G01; G01N; G01N22/00; G01N22/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
167 words
A hollow waveguide for use in the measurement of moisture content of a moving sheet or web of material comprising, in combination: two mutually opposed channel-section waveguide portions; means mounting said portions opposite each other with a slot therebetween adapted to receive said material therethrough; a pair of connecting waveguide portions, one of said pair connected to one end of one of said channel portions, the other of said pair connected to the other end of said one of said channel portions, both of said pair of connecting portions projecting away from the plane of the slot and on the same side of said plane, the other ends of said connecting portions being adapted to be connected to a microwave source and detector, respectively; and pivoting means included in said mounting means for moving the other of said channel portions away from said one channel portion so that the width of the slot can be increased to permit passage through the slot of different thickness of material.
Claim 2
Dependent Claim
167 words
A hollow waveguide for use in the measurement of moisture content of a moving sheet or web of material comprising, in combination: two mutually opposed channel-section waveguide portions; means mounting said portions opposite each other with a slot therebetween adapted to receive said material therethrough; a pair of connecting waveguide portions, one of said pair connected to one end of one of said channel portions, the other of said pair connected to the other end of said one of said channel portions, both of said pair of connecting portions projecting away from the plane of the slot and on the same side of said plane, the other ends of said connecting portions being adapted to be connected to a microwave source and detector, respectively; and pivoting means included in said mounting means for moving the other of said channel portions away from said one channel portion so that the width of the slot can be increased to permit passage through the slot of different thickness of material.
Claim 3
Dependent Claim
36 words
A waveguide according to claim 1 wherein a further waveguide section communicates with said other end of one of the connecting portions, said further waveguide section having its axis inclined relative to said connecting portion axis.
Claim 4
Dependent Claim
100 words
A waveguide according to claim 1 and being of rectangular cross section, wherein a further waveguide section communicates with said other end of each connecting portion, said further waveguide sections having their axes inclined relative to the axes of their associated connecting portions axes and defining input and output limbs for said channel portion, and wherein the slot is parallel to the E-plane of the waveguide, said channel portion being offset from said E-plane by the connecting portions, one of which extends into a curved path region of its associated further waveguide section whereby the waveguide is of hairpin form.
Claim 5
Dependent Claim
55 words
A waveguide according to claim 1 and being of rectangular cross section, wherein a further waveguide section communicates with said other end of each connecting portion, one of said further waveguide sections having a curved path region to give the waveguide a hairpin form, said curved path region lying in the H-plane of the waveguide.
Claim 6
Dependent Claim
72 words
A plurality of waveguides according to claim 1 wherein each waveguide includes a pair of further waveguide sections communicating with respective said other ends of the connecting portions, one of said further waveguide sections having a curved path region to give the waveguide a hairpin form, the respective channel portions of the waveguides being disposed in spaced positions with their slots coplanar and means being provided to connect the waveguides in series.
Claim 7
Dependent Claim
30 words
A plurality of waveguides according to claim 5 wherein connecting means are provided between the movable parts of the channel portions linking said parts together to move them in unison.
Claim 8
Dependent Claim
36 words
A plurality of waveguides according to claim 5 wherein energy path changeover means are provided between the channel portions whereby selected channel portions can be connected in a series arrangement for the transmission of microwave energy.
Claim 9
Dependent Claim
37 words
A waveguide according to claim 1 wherein said mounting means comprises a support, and a pivot axis for said support extending along the length of the movable channel portion and spaced from the plane of the slot.
Claim 10
Dependent Claim
81 words
A waveguide according to claim 1 wherein respective further waveguide portions communicate with the other ends of the connecting portions, each said further waveguide portion having its axis inclined relative to its associated connecting portion axis, said further waveguide portions defining input and output limbs extending over the plane of the slot transversely to said channel portion to the same side thereof whereby they can project beyond the lateral extent of a web when said channel portion is located longitudinally therealong.
Claim 11
Dependent Claim
19 words
A waveguide according to claim 9 wherein the movable channel portion is rockable in the direction of its length.
Claim 12
Dependent Claim
26 words
A waveguide according to claim 1 wherein a resilient constraint acts on the movable channel portion to urge it into registration with said other channel portion.
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |