US3422068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing an ortho-directed phenolic resin by condensing phenol and hcho in the presence of a bivalent metal ion and then adding resorcinol,and the resultant product
Assignee: Weyerhaeuser Co
•
Filing: 1966-02-25
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Granted: 1969-01-14
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Expires: 1986-02-25
Abstract
No abstract record available.
Inventors
- 👤 Roland E Kreibich
- 👤 Harlan G Freeman
- 👤 Gene F Baxter
- 👤 Karl F Kumli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/24; C09; C09J; C09J161/00; C09J161/04; C09J161/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1851021A
Cited
US2385373A
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US2489336A
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US2589286A
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US2513274A
Cited
US2639258A
Cited
US2736718A
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US2940954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |