Patent US2674594A successfully refreshed from Google Patents.
US2674594A
Expired / Lapsed
US
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Alkali-metal sulfite-digested redwood bark solubles
Assignee: Pacific Lumber Co
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Filing: 1951-04-11
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Granted: 1954-04-06
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Expires: 1971-04-11
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 17:07
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
AS A NEW COMPOSITION OF MATTER, ALKALIMETAL SULFITE-DIGESTED REDWOOD BARK SOLUBLES SAID COMPOSITION CONSISTING ESSENTIALLY OF ALKALI SALTS OF SULFONATED REDWOOD BARK ACIDS.
Claim 2
Dependent Claim
23 words
AS A NEW COMPOSITION OF MATTER, ALKALIMETAL SULFITE-DIGESTED REDWOOD BARK SOLUBLES SAID COMPOSITION CONSISTING ESSENTIALLY OF ALKALI SALTS OF SULFONATED REDWOOD BARK ACIDS.
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) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |