US2670036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray drying
Assignee: Wyeth Holdings LLC
•
Filing: 1949-08-03
•
Granted: 1954-02-23
•
Expires: 1969-08-03
Abstract
No abstract record available.
Inventors
- 👤 William L Spalding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:18
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/16; B01D1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1350072A
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US1648937A
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US1924905A
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US1950263A
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US1985987A
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US2312474A
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US2327889A
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US2384998A
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US2413420A
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US2566292A
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US2575748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |