Patent US2972171A successfully refreshed from Google Patents.
US2972171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of wood fiber
Assignee: Weyerhaeuser Co
•
Filing: 1952-10-04
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Granted: 1961-02-21
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Expires: 1972-10-04
Abstract
No abstract record available.
Inventors
- 👤 Clark C Heritage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:47
CPC Classifications
D; D21; D21D; D21D5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1574384A
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US1577545A
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US1897620A
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US2090955A
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US2325055A
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US2405213A
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US2454534A
Cited
US2420036A
Cited
US2553412A
Cited
US2540348A
Cited
US2626864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-21 | 1964-08-22 | 1965-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-21 | 1968-08-22 | 1969-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-21 | 1972-08-22 | 1973-02-21 | $7700.00 | Window Closed / Lapsed |