US3810248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave heating apparatus
Assignee: Husqvarna Vapenfabriks AB
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Filing: 1971-10-12
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Granted: 1974-05-07
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Expires: 1991-10-12
Abstract
Abstract A microwave heating apparatus is disclosed, the apparatus being provided with a treatment chamber, a microwave source, and a wave guide having a mode converter. A first section of the wave guide connected to the treatment chamber is joined to a second section connected to the microwave source and has a rectangular crosssectional area with sides approximately equal to a and b under formation of a so-called H-bend, the first section having a cross-sectional area in the form of a rectangle with sides approximately equal to n X a and b, where n 2, 3, 4, etc., and wherein the H-bend between two outer sides of the respective wave guide sections have a corner-plate parallel to the rectangle side b of the wave guide cross-section areas and form inside obtuse angles with the outer side. The apparatus ensures spreading and distribution of the radiation in the treatment chamber with an even intensity.
Inventors
- 👤 Per Olov Risman
- 👤 Lars Rosengren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:16
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/80; H05B6/70; H05B6/707; H05B6/708
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A microwave heating apparatus including treatment means, a microwave source connected to a wave guide having a mode converter, said wave guide being provided with first and second sections, said first section having a width of a and a height of b, said second section having a width equal to n.a. in which n 2,3,4, etc. and a height equal to b, said first section being connected to the microwave source, said second section being connected to said treatment means, said first section being joined to said second section by an H-bend forming inside obtuse angles between the outer b sides of said first and second sections.
Claim 2
Dependent Claim
107 words
A microwave heating apparatus including treatment means, a microwave source connected to a wave guide having a mode converter, said wave guide being provided with first and second sections, said first section having a width of a and a height of b, said second section having a width equal to n.a. in which n 2,3,4, etc. and a height equal to b, said first section being connected to the microwave source, said second section being connected to said treatment means, said first section being joined to said second section by an H-bend forming inside obtuse angles between the outer b sides of said first and second sections.
Claim 3
Dependent Claim
33 words
The apparatus as claimed in claim 1 in which one of said sides having dimension a of said first section is provided with an aerial inlet to which the microwave source is connected.
Claim 4
Dependent Claim
23 words
The apparatus as claimed in claim 1 in which the second section includes an applicator provided with slots through which microwave energy radiates.
Claim 5
Dependent Claim
27 words
The apparatus as claimed in claim 3 in which said applicator is arranged on a side dimensioned n.a. and is defined by a number of slots therein.
Claim 6
Dependent Claim
37 words
The apparatus as claimed in claim 4 further including vessel means including a plate means having a high coefficient of microwave absorption converting microwave energy to thermal energy, and an external holder detachably fitting the vessel means.
Claim 7
Dependent Claim
22 words
The apparatus as claimed in claim 5 in which the plate means includes a layer of a high coefficient of microwave absorption.
Claim 8
Dependent Claim
138 words
The apparatus as claimed in claim 1 further including a branch section connected to said first section to extend at right angles thereto, said branch section having a width of a and a height of b, said branch section being connected to a further section having a width approximately three times the width of the branch section, and a height of b, said further section being joined to said branch section by an H-bend forming inside obtuse angles between the outer b sides of said branch and said further section, and a switching means at the connection between the branch section and first section movable between a position oblique to the first section and a position parallel with the first section for directing radiation from said microwave source into the branch section and into the first section respectively.
References Cited (Backward Citations)
US2576862A
Cited
US2673962A
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US2600566A
Cited
US2814708A
Cited
US2909635A
Cited
US3539751A
Cited
US3662141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |