US3746822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split folded waveguide with leakage preventive apertures
Assignee: Societe des Produits Nestle SA
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Filing: 1971-04-23
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Granted: 1973-07-17
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Expires: 1991-04-23
Abstract
Abstract Microwave heating apparatus comprising a conveyor band carrying material through a split folded waveguide comprising straight and curved elements, the slots in the straight elements for the passage of the conveyor having lips which are not more than oneeighth of the wavelength apart.
Inventors
- 👤 Viet T Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:55
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; A; A23; A23B; A23B2/00; A23B2/05; A23B2/08; A23B2/90; A23B2/92; A23F; A23F5/00; A23F5/04; A23N; A23N12/00; A23N12/08; F; F26; F26B; F26B3/00; F26B3/32; F26B3/34; H05B2206/00; H05B2206/04; H05B2206/046
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
100 words
Microwave heating apparatus comprising a conveyor for carrying the material to be treated, a microwave generator and a split folded waveguide, the said waveguide having straight elements perpendicular to the direction of travel of the conveyor and curved elements alternately connecting said straight elements, said straight elements being provided with slots for the passage of the conveyor and the material and having spaced upper and lower lips adjacent said slots, each of said lips being provided with inwardly extending grooves together forming a resonator, the separation between said lips being not more than one-eighth of the wavelength in the waveguide.
Claim 2
Dependent Claim
100 words
Microwave heating apparatus comprising a conveyor for carrying the material to be treated, a microwave generator and a split folded waveguide, the said waveguide having straight elements perpendicular to the direction of travel of the conveyor and curved elements alternately connecting said straight elements, said straight elements being provided with slots for the passage of the conveyor and the material and having spaced upper and lower lips adjacent said slots, each of said lips being provided with inwardly extending grooves together forming a resonator, the separation between said lips being not more than one-eighth of the wavelength in the waveguide.
Claim 3
Dependent Claim
22 words
Microwave heating apparatus according to claim 1, in which the width of the lip grooves is approximately one-ninth of the lip separation.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |