Patent US2698233A successfully refreshed from Google Patents.
US2698233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Redwood bark cooking process and resulting products
Assignee: Pacific Lumber Co
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Filing: 1949-09-07
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Granted: 1954-12-28
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Expires: 1969-09-07
Abstract
No abstract record available.
Inventors
- 👤 Harry F Lewis
- 👤 Marion A Buchanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:30
CPC Classifications
D; D21; D21C; D21C5/00; D21J; D21J1/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
16 words
AS AN ARTICLE OF MANUFACTURE, AN INSULATION BOARD COMPRISING CONSOLIDATED ALKALI SULFATE DIGESTED REDWOOD BARK PULP.
References Cited (Backward Citations)
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US1229422A
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US1244525A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |