US3725628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave applicator with throughput suppression guides at input and output ports
Assignee: MICRODRY Inc A CORP OF KENTUCKY
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Filing: 1971-10-29
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Granted: 1973-04-03
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Expires: 1991-10-29
Abstract
Abstract Wave guides are placed at the input and output ports of a microwave applicator for treating material whereby the material may pass through the throughput wave guides but the passage of microwaves is suppressed by the throughput wave guides without absorption of the microwave energy.
Inventors
- 👤 R Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:31
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/70; H05B6/707; H05B6/76; H05B6/78
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
181 words
In combination, a microwave applicator device for applying microwave energy to a material, said applicator having a cavity containing microwave energy having a wavelength lambda 0, said applicator being provided with aN input port leading into said cavity and an output port leading from said cavity; and a suppression wave guide connected to at least one of said ports and through which said material may pass, said wave guide comprising a plurality of individual wave guide sections having conductive walls, each of said individual wave guide sections having a closed rectangular cross section from an input mouth to an exit aperture with a first side dimension of the input mouth of each guide section being less than about one-half lambda 0 and a second side dimension of said mouth taken perpendicular to said first side dimension being less than about lambda 0 and greater than one-half lambda 0, the walls of each wave guide section being tapered until said second side dimension is less than about one-half lambda 0 while maintaining the cross sectional area of each section be approximately constant.
Claim 2
Dependent Claim
181 words
In combination, a microwave applicator device for applying microwave energy to a material, said applicator having a cavity containing microwave energy having a wavelength lambda 0, said applicator being provided with aN input port leading into said cavity and an output port leading from said cavity; and a suppression wave guide connected to at least one of said ports and through which said material may pass, said wave guide comprising a plurality of individual wave guide sections having conductive walls, each of said individual wave guide sections having a closed rectangular cross section from an input mouth to an exit aperture with a first side dimension of the input mouth of each guide section being less than about one-half lambda 0 and a second side dimension of said mouth taken perpendicular to said first side dimension being less than about lambda 0 and greater than one-half lambda 0, the walls of each wave guide section being tapered until said second side dimension is less than about one-half lambda 0 while maintaining the cross sectional area of each section be approximately constant.
Claim 3
Dependent Claim
110 words
The combination of claim 1 wherein the exit aperture of each of said wave guide sections is rectangular having a first side dimension parallel to said second side dimension of the input mouth of said section less than about one-half lambda 0 and a second transverse side dimension parallel to said first dimension of said input mouth of said section being less than about lambda 0 and greater than about one-half lambda 0, and wherein the overall length of the tapered portion of each section in the direction of power flow is sufficient to achieve a 10 db. attenuation for the TE10 mode when a product is not being processed.
Claim 4
Dependent Claim
42 words
The system of claim 1 wherein the taper of each of the walls of said individual wave guide sections is uniform and wherein the cross sectional area of each individual wave guide section remains approximately constant in the direction of power flow.
Claim 5
Dependent Claim
42 words
The system of claim 2 wherein said first dimension of the mouth of each of said wave guide sections of said throughput suppression wave guide is approximately one-half lambda 0 and said second side dimension of said mouth is approximately lambda 0.
Claim 6
Dependent Claim
45 words
The system of claim 4 wherein said first dimension of the output aperture of each individual wave guide section is approximately equal to lambda 0 and said second dimension of the output aperture of each of said wave guide sections is approximately one-half lambda 0.
Claim 7
Dependent Claim
34 words
The system of claim 1 characterized by the fact that the material being processed is bulk material which passes through said suppression wave guide along the direction of power flow under force of gravity.
Claim 8
Dependent Claim
152 words
The system of claim 1 further comprising a second suppression wave guide connected to said applicator at the other of said ports through which said material may pass, said second wave guide comprising a plurality of individual wave guide sections having conductive walls, each individual section of said second wave guide having a closed rectangular cross section of approximately constant area from an input mouth to an exit aperture, a first side dimension of the input mouth of each section of said second wave guide being less than about one-half lambda 0 and a second side dimension taken perpendicular to said first dimension being less than about lambda 0 and greater than about one-half lambda 0, the walls of each section of said second wave guide being tapered until said second side dimension of the sections of said second wave guide at the discharge aperture is less than about one-half lambda 0.
Claim 9
Dependent Claim
164 words
A wave guide section having an opening therein for passing materials therethrough while suppressing the passage therethrough of microwave energy having a wave length of lambda 0 comprising conductive walls having a closed rectangular cross section and extending about said opening, said walls being tapered from a cross-sectional dimension equal to less than about one-half lambda 0 at one end of said section to a value greater than one-half lambda 0 but less than lambda 0 at a cross section taken at the oTher end of said section and a second dimension taken at a cross section at said one end taken perpendicular to said first mentioned dimension being more than about one-half lambda 0 but less than lambda 0, said last mentioned dimension being less than one-half lambda 0 when taken at the cross section at the other end of said section, said opening through said section being rectangular and of substantially constant area from one end of said section to the other.
Claim 10
Dependent Claim
164 words
A wave guide section having an opening therein for passing materials therethrough while suppressing the passage therethrough of microwave energy having a wave length of lambda 0 comprising conductive walls having a closed rectangular cross section and extending about said opening, said walls being tapered from a cross-sectional dimension equal to less than about one-half lambda 0 at one end of said section to a value greater than one-half lambda 0 but less than lambda 0 at a cross section taken at the oTher end of said section and a second dimension taken at a cross section at said one end taken perpendicular to said first mentioned dimension being more than about one-half lambda 0 but less than lambda 0, said last mentioned dimension being less than one-half lambda 0 when taken at the cross section at the other end of said section, said opening through said section being rectangular and of substantially constant area from one end of said section to the other.
Claim 11
Dependent Claim
43 words
A wave guide according to claim 8 comprising a plurality of said sections located side-by-side with a shorter cross-sectional dimension of one end of one of said sections being adjacent the shorter cross-sectional side of one end of the other of said sections.
Claim 12
Dependent Claim
98 words
A suppression wave guide for suppressing radiation of microwave energy while permitting the passage of material therethrough comprising a wave guide having four conductive planar walls arranged in opposing pairs to provide an input mouth nd an exit aperture, said pairs of walls tapering in opposite directions and being so dimensioned as to provide a substantially constant cross-sectional area from said input mouth to said exit aperture, said walls being dimensioned to suppress the passage of the orthogonal primary modes of microwave energy at a wave length of lambda 0 at said inlet mouth and said exit aperture.
Claim 13
Dependent Claim
98 words
A suppression wave guide for suppressing radiation of microwave energy while permitting the passage of material therethrough comprising a wave guide having four conductive planar walls arranged in opposing pairs to provide an input mouth nd an exit aperture, said pairs of walls tapering in opposite directions and being so dimensioned as to provide a substantially constant cross-sectional area from said input mouth to said exit aperture, said walls being dimensioned to suppress the passage of the orthogonal primary modes of microwave energy at a wave length of lambda 0 at said inlet mouth and said exit aperture.
Claim 14
Dependent Claim
34 words
A wave guide as set forth in claim 8 wherein said section is arranged with its length in a substantially vertical direction whereby material may be passed through said section by force of gravity.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |