US2156245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation of phosphate rock
Assignee: Wyeth Holdings LLC
•
Filing: 1938-04-26
•
Granted: 1939-04-25
•
Expires: 1958-04-26
Abstract
No abstract record available.
Inventors
- 👤 Mead Harry Levi
- 👤 Weaver Joseph Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:06
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/021; C; C05; C05B; C05B11/00; C05B11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-04-24 | 1942-10-24 | 1943-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-24 | 1946-10-24 | 1947-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-24 | 1950-10-24 | 1951-04-25 | $7700.00 | Window Closed / Lapsed |