US2130065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization method
Assignee: American Potash and Chemical Corp
•
Filing: 1930-03-07
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Granted: 1938-09-13
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Expires: 1950-03-07
Abstract
No abstract record available.
Inventors
- 👤 William E Burke
- 👤 William H Allen
- 👤 Robert B Peet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:24
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0018; B01D9/0022
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) | 1941-09-12 | 1942-03-14 | 1942-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-09-12 | 1946-03-14 | 1946-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-09-12 | 1950-03-14 | 1950-09-13 | $7700.00 | Window Closed / Lapsed |