US3858022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave applicator
Assignee: MICRODRY Inc A CORP OF KENTUCKY
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Filing: 1972-04-21
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Granted: 1974-12-31
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Expires: 1992-04-21
Abstract
Abstract An applicator for microwave energy employing a heating chamber with inlet and outlet openings and an attenuation channel communicating with one of these openings. A conveyor is arranged to carry material to be treated in and out of the openings and through the channel. A feature of the applicator is the provision of an attenuation section in the channel which has spaced plates forming passages containing microwave absorbing material. Another feature is the provision of an intermediate attenuation section wherein a liquid which is lossy to microwaves is circulated into access with microwave energy within the intermediate section.
Inventors
- 👤 F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:24
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; H05B6/782; H05B6/76
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
143 words
Microwave Applicator Apparatus comprising a casing providing a heating cavity and having openings through which material to be treated may be passed into and out of said cavity, means for exciting said cavity with microwave energy, an attenuating channel having its one end in communication with one of said openings and having at its other end an opening through which said material may be passed, said channel having conducting outer walls and having at one section thereof between said ends a lining adjacent to said outer walls formed of a sheet material which is lossy to microwave energy, a flat side of said sheet material being in contact with said walls, said section containing a plurality of passageways leading from the interior thereof to one of said outer walls, said passageways being formed by spaced plates of conducting material extending across said section.
Claim 2
Dependent Claim
143 words
Microwave Applicator Apparatus comprising a casing providing a heating cavity and having openings through which material to be treated may be passed into and out of said cavity, means for exciting said cavity with microwave energy, an attenuating channel having its one end in communication with one of said openings and having at its other end an opening through which said material may be passed, said channel having conducting outer walls and having at one section thereof between said ends a lining adjacent to said outer walls formed of a sheet material which is lossy to microwave energy, a flat side of said sheet material being in contact with said walls, said section containing a plurality of passageways leading from the interior thereof to one of said outer walls, said passageways being formed by spaced plates of conducting material extending across said section.
Claim 3
Dependent Claim
109 words
Microwave Applicator Apparatus comprising a casing providing a heating cavity and having openings through which material to be treated may be passed into and out of said cavity, means for exciting said cavity with microwave energy, and an attenuating channel having its one end in communication with one of said openings and having at its other end an opening through which said material can be passed, said channel having conducting outer walls and containing at one section thereof a plurality of passageways leading from the interior of the channel to one of the outer walls, said passageways being formed by spaced plates of conducting material extending across said section.
Claim 4
Dependent Claim
109 words
Microwave Applicator Apparatus comprising a casing providing a heating cavity and having openings through which material to be treated may be passed into and out of said cavity, means for exciting said cavity with microwave energy, and an attenuating channel having its one end in communication with one of said openings and having at its other end an opening through which said material can be passed, said channel having conducting outer walls and containing at one section thereof a plurality of passageways leading from the interior of the channel to one of the outer walls, said passageways being formed by spaced plates of conducting material extending across said section.
Claim 5
Dependent Claim
21 words
Apparatus as set forth in claim 2 wherein each of said passageways contains a material which is lossy to microwave energy.
Claim 6
Dependent Claim
30 words
Apparatus as set forth in claim 2 wherein said passageways have closed ends and have a layer of said material across their ends and along at least one sidewall thereof.
Claim 7
Dependent Claim
44 words
Apparatus as set forth in claim 2 wherein said section is rectangular in cross section with broad top and bottom walls and wherein said passageways are vertical and extend upwardly from the interior of said section to their ends at said top broad wall.
Claim 8
Dependent Claim
39 words
Apparatus as set forth in claim 2 wherein said means is for exciting said cavity at a predetermined frequency and wherein said passageways have a depth of from one-eighth to three-eighth of the wave length of said predetermined frequency.
Claim 9
Dependent Claim
22 words
Apparatus as set forth in claim 6 wherein said passageways have a depth of about one-fourth wave length of said predetermined frequency.
Claim 10
Dependent Claim
46 words
Apparatus as set forth in claim 2 wherein said plates have a lining on one side thereof formed of a lossy material and wherein said plates are uniformly spaced and in planes parallel with each other whereby said passages are of uniform width throughout their depth.
Claim 11
Dependent Claim
53 words
Apparatus as set forth in claim 2 wherein said channel has an intermediate section between said heating cavity and said one section, means for circulating a lossy liquid through said intermediate section whereby microwave energy passing from said cavity into said one section may be at least partially absorbed in said lossy liquid.
Claim 12
Dependent Claim
21 words
Apparatus as set forth in claim 9 wherein said plates are lined on one side with a layer of lossy material.
Claim 13
Dependent Claim
81 words
In a microwave applicator an attenuator section having an open passage from one end to the other through which materials to be treated by the applicator may be passed, an outer metal casing, a plurality of spaced metal plates in said casing providing passages leading from the interior to one wall of said casing, said plates having a lining on one side thereof of a material lossy to microwave energy, whereby microwave energy entering said passages is absorbed in said lining.
Claim 14
Dependent Claim
81 words
In a microwave applicator an attenuator section having an open passage from one end to the other through which materials to be treated by the applicator may be passed, an outer metal casing, a plurality of spaced metal plates in said casing providing passages leading from the interior to one wall of said casing, said plates having a lining on one side thereof of a material lossy to microwave energy, whereby microwave energy entering said passages is absorbed in said lining.
Claim 15
Dependent Claim
41 words
Apparatus as set forth in claim 11 wherein said plates have their end portions turned forwardly with the end edges abutting the adjacent plates whereby the spacing between said plates is determined by the length of said forwardly turned end portions.
Claim 16
Dependent Claim
24 words
Apparatus as set forth in claim 11 wherein said frequency is about 2450 HMz and the depth of said passages is about 1 inch.
Claim 17
Dependent Claim
21 words
Apparatus as set forth in claim 11 including a sheet of said lossy material closing said passageways at said one wall.
Claim 18
Dependent Claim
34 words
Apparatus as set forth in claim 11 wherein said microwave energy has a predetermined frequency and the depth of said passages is about one-eighth to three-eighths of the wave length of said predetermined frequency.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |