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US3470148A
Expired / Lapsed
US
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Reaction products of lignin and bark extracts and process for same
Assignee: Weyerhaeuser Co
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Filing: 1966-12-16
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Granted: 1969-09-30
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Expires: 1986-12-16
Abstract
No abstract record available.
Inventors
- 👤 George Graham Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:55
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA702827A
Cited
US3296159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |