US3740515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave heating apparatus
Assignee: Canadian Patents and Development Ltd
•
Filing: 1971-07-07
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Granted: 1973-06-19
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Expires: 1991-07-07
Abstract
Abstract A microwave heating apparatus for line heating a dielectric sheet material comprises a trough waveguide having a central ridge extending along the trough, and a metal member spaced from the ridge so that the sheet may be passed in the longitudinal direction of the ridge and between the ridge and the metal member. The dielectric sheet material may be a paper carrying an ink mark to be dried, and the metal member may be a metal drum having the paper extending around it. The trough waveguide extends circumferentially around a portion of the drum and closely follows the drum contour.
Inventors
- 👤 A Vankoughnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:37
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
Microwave heating apparatus, comprising an open trough waveguide having side walls and a base, a ridge attached to a central region of the base between the side walls and extending longitudinally of the waveguide, the height of the ridge being substantially the same as the height of the side walls, and a metal member extending along and covering the whole length of the open side of the trough but spaced from the trough, said metal member forming a guide for passing one side of dielectric sheet adjacent the ridge with the metal member on the other side of the sheet, so that energisation of the waveguide will heat the sheet passed between the ridge and the metal member.
Claim 2
Dependent Claim
118 words
Microwave heating apparatus, comprising an open trough waveguide having side walls and a base, a ridge attached to a central region of the base between the side walls and extending longitudinally of the waveguide, the height of the ridge being substantially the same as the height of the side walls, and a metal member extending along and covering the whole length of the open side of the trough but spaced from the trough, said metal member forming a guide for passing one side of dielectric sheet adjacent the ridge with the metal member on the other side of the sheet, so that energisation of the waveguide will heat the sheet passed between the ridge and the metal member.
References Cited (Backward Citations)
US2868939A
Cited
US2943325A
Cited
US2957173A
Cited
US3013267A
Cited
US3015100A
Cited
US3470343A
Cited
US3532848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |