Patent US3714716A successfully refreshed from Google Patents.
US3714716A
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US
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Process for kiln drying lumber by means of a predetermined drying rate
Assignee: Weyerhaeuser Co
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Filing: 1970-06-29
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Granted: 1973-02-06
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Expires: 1990-06-29
Abstract
Abstract D R A W I N G AN IMPROVED PROCESS FOR KILN DRYING WOOD WITH A CONDITIONED CIRCULATING FLUID, SUCH AS HEATED AIR, IS DESCRIBED. A DESIRED RATE OF MOISTURE LOSS IS INITIALLY CHOSEN. THIS RATE IS ACHIEVED AND MAINTAINED BY CONTROL OF THE RATE OF ENERGY TRANSFER FROM THE FLUID TO THE WOOD. IN CONTRAST TO PRIOR ART METHODS, THE RATE OF ENERGY LOSS FROM THE FLUID TO THE WOOD IS HERE HELD AS AN INDEPENDENT VARIABLE. THIS ENERGY LOSS IS SENSED AND THE ENTERING AIR IS ALLOWED TO ASSUME WHATEVER TEMPERATURE NECESSARY TO MAINTAIN THE SELECTED RATE OF MOISTURE LOSS. THE ENTERING AIR DRY BULB TEMPERATURE THUS BECOMES A DEPEDENT VARIABLE.
Inventors
- 👤 D Dedrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:25
CPC Classifications
F; F26; F26B; F26B3/00; F26B3/02; F26B21/00; F26B21/30; F26B2210/00; F26B2210/16
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |