US2445478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline material preparation
Assignee: Wyeth Holdings LLC
•
Filing: 1944-09-06
•
Granted: 1948-07-20
•
Expires: 1964-09-06
Abstract
No abstract record available.
Inventors
- 👤 George H Foster
- 👤 Emil F Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:35
CPC Classifications
C; C06; C06B; C06B25/00; C06B25/34; B; B23; B23Q; B23Q5/00; B23Q5/22; B23Q5/26; B23Q5/266; B23Q5/268; C06B23/00; C06B23/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1679752A
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US2258612A
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US2395856A
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US2395857A
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US2395858A
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US2395859A
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US2395860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-20 | 1952-01-19 | 1952-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-20 | 1956-01-19 | 1956-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-20 | 1960-01-19 | 1960-07-20 | $7700.00 | Window Closed / Lapsed |