US2456443A
Expired / Lapsed
US
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Process for preparing nordihydroguaiaretic acid and intermediates
Assignee: Wyeth LLC
•
Filing: 1946-12-06
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Granted: 1948-12-14
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Expires: 1966-12-06
Abstract
No abstract record available.
Inventors
- 👤 George P Mueller
- 👤 Eric T Stiller
- 👤 Samuel V Lieberman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:55
CPC Classifications
C; C11; C11B; C11B5/00; C11B5/0042; C11B5/005; A; A23; A23B; A23B2/00; A23B2/70; A23B2/725; A23B2/729; A23B2/742; A23B2/754; A23B2/771; C07; C07C; C07C37/00; C07C37/01; C07C37/055; C07C37/0555
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2272153A
Cited
US2421118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |