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US3712971A
Expired / Lapsed
US
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Waveguide apparatus for microwave drying of materials
Assignee: MacMillan Bloedel Ltd
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Filing: 1971-06-03
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Granted: 1973-01-23
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Expires: 1991-06-03
Abstract
Abstract A 4-PORT HYBIRD COUPLING A MICROWAVE GENERATOR TO A SET OF WAVEGUIDES WHICH HAVE SLOTS THEREIN THROUGH WHICH LUMBER CAN TRAVEL AT AN ANGLE OF LESS THAN 90* TO THE LONGITUDINAL CENTERLINES OF THE WAVEGUIDES.
Inventors
- 👤 L Admiraal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:37
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; H05B2206/00; H05B2206/04; H05B2206/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |