US3649397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of products from comminuted wood
Assignee: Pope and Talbot Inc
•
Filing: 1969-04-04
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Granted: 1972-03-14
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Expires: 1989-04-04
Abstract
Abstract A PROCESS FOR PREPARING A WOOD MIXTURE COMPRISING COMMINUTED WOOD HAVING UREA AND UREA AND A UREA-FORMALDEHYDE CONCENTRATE INCORPORATED WITH THE COMMINUTED WOOD AT TWO STAGES. THE UREA IS ADDED TO THE COMMINUTED WOOD FIRST, AND THE RESULTING WOOD MASS IS DRIED PRIOR TO THE DISTRIBUTION IN THW WOOD MASS OF THE UREA-FORMALDEHYDE CONCENTRATES. THE MAKING OF A CONSOLIDATED PRODUCT BY HEATING AND PRESSING SUCH A WOOD MIXTURE CONTAINING UREA-FORMALDEHYDE CONCENTRATE, WITH RESINIFICATION OCCURRING DURING SUCH HEATING AND PRESSING TO FORM A UREA RESIN BINDER.
Inventors
- 👤 Thomas E Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:33
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |