US3591448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wood with a densified surface layer and method of making same
Assignee: Individual
•
Filing: 1966-08-15
•
Granted: 1971-07-06
•
Expires: 1986-08-15
Abstract
Abstract THIS INVENTION RELATES TO A METHOD OF DENSIFYING WOOD TO PROVIDE A BOARD COMPOSED OF LIGNO-CELLULOSIC FIBERS ARRANGED IN ANNULAR RINGS CONTAINING SPRING AND SUMMER WOOD, IN WHICH THE SUMMER WOOD IS OF SUBSTANTIALLY THE SAME DENSITY IN EACH RING FROM ONE SURFACE OF THE BOARD TO THE OPPOSITE SURFACE AND THE SPRING WOOD IS COMPACTED IN AN OUTER SURFACE ZONE OF THE BOARD BETWEEN THE RINGS OF THE SUMMER WOOD WITHOUT CASE HARDENING THE WOOD.
Inventors
- 👤 Armin Elmendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:11
CPC Classifications
B; B27; B27M; B27M1/00; B27M1/02; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24983; Y10T428/24992; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T428/3196; Y10T428/31971; Y10T428/31975
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |