Patent US3701875A successfully refreshed from Google Patents.
US3701875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
H. f. heating apparatus
Assignee: Intertherm Ltd
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Filing: 1970-06-15
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Granted: 1972-10-31
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Expires: 1990-06-15
Abstract
Abstract A high frequency dielectric heating apparatus with a novel stray-field platen. The platen comprises a first group of a parallel rod electrodes spaced apart in a first plane. A second group of parallel rod electrodes are alternately arranged between and in parallel with the first group of electrodes. In one region of the platen the rods of the second group are displaced in a direction away from the material to be heated, whereas in a second region of the platen the rods of the second group are closer to the material, or even in the same plane as the rods of the first group. The two regions produce different heating effects on the dielectric material. A high frequency generator is connected across adjacent electrodes. The spacing between the electrodes can be varied and the electrodes can be inclined at an angle to the lateral direction of the material to provide further variations in the heating effect across the platen.
Inventors
- 👤 Noel John Charles Witsey
- 👤 James Charles Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:11
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/46; H05B6/54
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
134 words
A stray-field platen for high-frequency heating apparatus comprising a high frequency energy supply, a plurality of rodlike electrodes arranged in operation so that adjacent rod-like electrodes are connected across said high-frequency supply, one group of alternate electrodes being spaced apart so as to define a path of travel adjacent thereto for the material to be heated and another group of alternate rod-like electrodes being alternately arranged on the same side of the material and between the electrodes of said one group and displaced therefrom in a direction away from the material to be heated within a predetermined region of said platen to reduce the heating effect on the material by the high-frequency field produced by the platen over said region in comparison with the heating effect otherwise produced in the absence of said displacement.
Claim 2
Dependent Claim
134 words
A stray-field platen for high-frequency heating apparatus comprising a high frequency energy supply, a plurality of rodlike electrodes arranged in operation so that adjacent rod-like electrodes are connected across said high-frequency supply, one group of alternate electrodes being spaced apart so as to define a path of travel adjacent thereto for the material to be heated and another group of alternate rod-like electrodes being alternately arranged on the same side of the material and between the electrodes of said one group and displaced therefrom in a direction away from the material to be heated within a predetermined region of said platen to reduce the heating effect on the material by the high-frequency field produced by the platen over said region in comparison with the heating effect otherwise produced in the absence of said displacement.
Claim 3
Dependent Claim
32 words
A stray-field platen as claimed in Claim 1 in which said predetermined region is that part of the platen adjacent to which, in operation, the material to be heated is first passed.
Claim 4
Dependent Claim
40 words
A stray-field platen as cLaimed in claim 1 wherein the physical displacement of the other group of alternate rod-like electrodes from said travel path progressively varies along the platen in the direction of travel of the material to be heated.
Claim 5
Dependent Claim
28 words
A stray-field platen as claimed in claim 1 wherein the lateral spacing between said rod-like electrodes varies in the direction of travel of the material to be heated.
Claim 6
Dependent Claim
154 words
A stray-field platen for high-frequency heating apparatus comprising a high frequency energy supply, a plurality of rod-like electrodes arranged in operation so that adjacent rod-like electrodes are connected across said high-frequency supply, one group of alternate electrodes being spaced apart so as to define a path of travel adjacent thereto for the material to be heated and another group of alternate rod-like electrodes being alternately arranged between the electrodes of said one group and being displaced therefrom in a direction away from the material to be heated within a predetermined region of said platen to reduce the heating effect on the material by the high-frequency field produced by the platen over said region in comparison with the heating effect otherwise produced in the absence of said displacement, said rod-like electrodes being arranged in the platen at an oblique angle other than 90* relative to the direction of travel of the material to be heated.
Claim 7
Dependent Claim
154 words
A stray-field platen for high-frequency heating apparatus comprising a high frequency energy supply, a plurality of rod-like electrodes arranged in operation so that adjacent rod-like electrodes are connected across said high-frequency supply, one group of alternate electrodes being spaced apart so as to define a path of travel adjacent thereto for the material to be heated and another group of alternate rod-like electrodes being alternately arranged between the electrodes of said one group and being displaced therefrom in a direction away from the material to be heated within a predetermined region of said platen to reduce the heating effect on the material by the high-frequency field produced by the platen over said region in comparison with the heating effect otherwise produced in the absence of said displacement, said rod-like electrodes being arranged in the platen at an oblique angle other than 90* relative to the direction of travel of the material to be heated.
Claim 8
Dependent Claim
68 words
A stray-field platen as claimed in claim 1 wherein said electrodes are divided into two groups, the electrodes of the first group being arranged in parallel in a first plane across which the material to be heated will pass, and the electrodes of the second group being alternately arranged between the electrodes of the first group in a second plane and parallel to said first group of electrodes.
Claim 9
Dependent Claim
43 words
A stray-field platen as claimed in claim 6 wherein the spacing between adjacent electrodes in a direction orthogonal to the longitudinal axes thereof of a first region of the platen is different from the electrode spacing in a second region of the platen.
Claim 10
Dependent Claim
35 words
A stray-field platen as claimed in claim 6 wherein the electrodes of said first and second groups are arranged at a non-perpendicular angle relative to the direction of travel of the material to be heated.
Claim 11
Dependent Claim
157 words
A stray-field platen for high-frequency heating apparatus comprising a high frequency energy supply, a plurality of rod-like electrodes arranged in operation so that adjacent rod-like electrodes are connected across said high-frequency supply, one group of alternate electrodes being spaced apart so as to define a path of travel adjacent thereto for the material to be heated and another group of alternate rod-like electrodes being alternately arranged between the electrodes of said one group and being displaced therefrom in a direction away from the material to be heated within a predetermined region of said platen to reduce the heating effect on the material by the high-frequency field produced by the platen over said region in comparison with the heating effect otherwise produced in the absence of said displacement, and wherein the distance between given ones of said alternate rod-like electrodes and said material varies along a portion of the platen in the direction of travel of the material.
Claim 12
Dependent Claim
157 words
A stray-field platen for high-frequency heating apparatus comprising a high frequency energy supply, a plurality of rod-like electrodes arranged in operation so that adjacent rod-like electrodes are connected across said high-frequency supply, one group of alternate electrodes being spaced apart so as to define a path of travel adjacent thereto for the material to be heated and another group of alternate rod-like electrodes being alternately arranged between the electrodes of said one group and being displaced therefrom in a direction away from the material to be heated within a predetermined region of said platen to reduce the heating effect on the material by the high-frequency field produced by the platen over said region in comparison with the heating effect otherwise produced in the absence of said displacement, and wherein the distance between given ones of said alternate rod-like electrodes and said material varies along a portion of the platen in the direction of travel of the material.
Claim 13
Dependent Claim
157 words
A high frequency heating apparatus for a material to be heated as it is moved along a given path of travel comprising, a source of high frequency electric energy, a stray-field platen assembly that includes two groups of rod electrodes sequentially arranged adjacent the path of travel of said material to be heated and on the same side thereof, the electrodes of one group being spaced apart and equidistant from the material as it moves along said travel path, the electrodes of the other group being alternately located between the electrodes of said one group with at least some of the electrodes of said other group positioned at a greater distance from said material than the electrodes of said one group, and means for connecting the elecTrodes to the terminals of said energy source whereby different regions of the platen in the direction of travel of the material produce different heating effects on the material adjacent thereto.
Claim 14
Dependent Claim
157 words
A high frequency heating apparatus for a material to be heated as it is moved along a given path of travel comprising, a source of high frequency electric energy, a stray-field platen assembly that includes two groups of rod electrodes sequentially arranged adjacent the path of travel of said material to be heated and on the same side thereof, the electrodes of one group being spaced apart and equidistant from the material as it moves along said travel path, the electrodes of the other group being alternately located between the electrodes of said one group with at least some of the electrodes of said other group positioned at a greater distance from said material than the electrodes of said one group, and means for connecting the elecTrodes to the terminals of said energy source whereby different regions of the platen in the direction of travel of the material produce different heating effects on the material adjacent thereto.
Claim 15
Dependent Claim
50 words
A heating apparatus as claimed in claim 10 wherein the electrodes of said one group are mounted in parallel in a first plane and at least some of the electrodes of said other group are mounted in parallel in a second plane and parallel to said one group of electrodes.
Claim 16
Dependent Claim
38 words
A heating apparatus as claimed in claim 11 wherein the lateral spacing between adjacent electrodes in a first region of the platen is different than the lateral spacing between adjacent electrodes in a second region of the platen.
Claim 17
Dependent Claim
31 words
A heating apparatus as claimed in claim 10 wherein said electrodes are arranged in parallel in the platen at an oblique angle relative to said path of travel of the material.
Claim 18
Dependent Claim
34 words
A heating apparatus as claimed in claim 10 including means for mounting other ones of the electrodes of said other group in positions at a still greater distance from said material to be heated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |