Patent US3749874A successfully refreshed from Google Patents.
US3749874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave applicator
Assignee: Raytheon Co
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Filing: 1972-06-02
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Granted: 1973-07-31
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Expires: 1992-06-02
Abstract
Abstract The entrance and exit waveguide access tunnel means of a conveyorized microwave applicator are structured to accommodate the width of the conveyor belt and at the same time substantially prevent excess leakage of energy from the open ports. The cutoff frequency characteristics of the waveguide sections are controlled to reduce energy leakage and still permit the transverse of a wide belt. The reduction of energy leakage is further enhanced by the provision of energy absorbing media in the access means.
Inventors
- 👤 R Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:59
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; H05B6/76
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
Conveyorized microwave heating apparatus comprising: a source of electromagnetic energy; a conductive enclosure with energy coupling means; access tunnel means coupled to opposing ends of said enclosure; means for transporting articles through said enclosure and access means enclosure; said access means having superimposed portions of different cross-sectional dimensions throughout their length; a first of said portions being dimensioned to accommodate said transporting means; and the second portion is dimensioned to provide a cutoff frequency wavelength characteristic to substantially prevent escape of energy and accommodate said transported articles.
Claim 2
Dependent Claim
87 words
Conveyorized microwave heating apparatus comprising: a source of electromagnetic energy; a conductive enclosure with energy coupling means; access tunnel means coupled to opposing ends of said enclosure; means for transporting articles through said enclosure and access means enclosure; said access means having superimposed portions of different cross-sectional dimensions throughout their length; a first of said portions being dimensioned to accommodate said transporting means; and the second portion is dimensioned to provide a cutoff frequency wavelength characteristic to substantially prevent escape of energy and accommodate said transported articles.
Claim 3
Dependent Claim
21 words
The applicator according to claim 1 wherein the inner walls of said access means are lined with an energy absorbing material.
Claim 4
Dependent Claim
30 words
The apparatus according to claim 1 wherein said energy coupling means comprise a rectangular waveguide having a substantially right angular bend and said access means are disposed at said bend.
References Cited (Backward Citations)
US3365562A
Cited
US3451014A
Cited
US3551199A
Cited
US3597565A
Cited
US3624335A
Cited
US3665141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |