Patent US3438847A successfully refreshed from Google Patents.
US3438847A
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US
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Process of treating composite boards with borate chemicals produced thereby and product
Assignee: Weyerhaeuser Co
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Filing: 1965-02-26
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Granted: 1969-04-15
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Expires: 1985-02-26
Abstract
No abstract record available.
Inventors
- 👤 Harry A Chase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:59
CPC Classifications
B; B27; B27N; B27N9/00; C; C08; C08L; C08L97/00; C08L97/02; D; D21; D21J; D21J1/00; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/31504; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |