Patent US3711346A successfully refreshed from Google Patents.
US3711346A
Expired / Lapsed
US
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Method of reproducing wood grain surface configurations
Assignee: Armstrong World Industries Inc
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Filing: 1970-04-15
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Granted: 1973-01-16
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Expires: 1990-04-15
Abstract
Abstract A SANDBLASTED WOOD GRAIN EFFECT IS DESIRABLE TO REPRODUCE IN METAL FOR ENGRAVING OTHER MATERIALS. OBLIQUE LIGHT IS USED TO CAST SHADOWS ON A PIECE OF SNADBLASTED WOOD. THE AXIS OF THE LIGHT IS SHIFTED RELATIVE TO THE PLANE OF THE SURFACE OF THE WOOD, AND A SERIES OF PHOTOGRAPHS ARE TAKEN. THE SERIES OF PHOTOGRAPHS ARE THEN USED TO PRODUCED NEGATIVES. THE NEGATIVES ARE USED IN A CHEMICAL MILLING PROCESS TO ETCH THE WOOD GRAIN CONFIGURATION INTO THE METAL PLATE.
Inventors
- 👤 E Landis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:08
CPC Classifications
B; B44; B44C; B44C1/00; B44C1/22; B44C1/221; B44C1/227; B44F; B44F9/00; B44F9/02
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |