Patent US3007971A successfully refreshed from Google Patents.
US3007971A
Expired / Lapsed
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Process for recovering polyphenols
Assignee: MacMillan Bloedel Ltd
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Filing: 1959-04-10
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Granted: 1961-11-07
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Expires: 1979-04-10
Abstract
No abstract record available.
Inventors
- 👤 Robert H J Creighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:47
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR RECOVERING POLYPHENOLS FROM AQUEOUS EXTRACTS OBTAINED BY LEACHING WITH WATER PARTICULATE WOOD SELECTED FROM THE GROUP CONSISTING OF WESTERN RED CEDAR AND CALIFORNIA REDWOOD, WHICH COMPRISES TREATING THE EXTRACT WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CALCIUM OXIDE AND CALCIUM HYDROXIDE TO GIVE A PH OF AT LEAST 9, AND SEPARATING THE RESULTING PRECIPITATE OF THE BASIC CALCIUM SALT OF THE POLYPHENOLS OF THE EXTRACT.
Claim 2
Dependent Claim
70 words
A PROCESS FOR RECOVERING POLYPHENOLS FROM AQUEOUS EXTRACTS OBTAINED BY LEACHING WITH WATER PARTICULATE WOOD SELECTED FROM THE GROUP CONSISTING OF WESTERN RED CEDAR AND CALIFORNIA REDWOOD, WHICH COMPRISES TREATING THE EXTRACT WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF CALCIUM OXIDE AND CALCIUM HYDROXIDE TO GIVE A PH OF AT LEAST 9, AND SEPARATING THE RESULTING PRECIPITATE OF THE BASIC CALCIUM SALT OF THE POLYPHENOLS OF THE EXTRACT.
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) | 1964-11-06 | 1965-05-08 | 1965-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-06 | 1969-05-08 | 1969-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-06 | 1973-05-08 | 1973-11-07 | $7700.00 | Window Closed / Lapsed |