US2251082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for the purification and separation of colloids from contaminating matter
Assignee: Individual
•
Filing: 1937-03-19
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Granted: 1941-07-29
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Expires: 1957-03-19
Abstract
No abstract record available.
Inventors
- 👤 Theorell Axel Hugo Teodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:36
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0039; B01D; B01D57/00; B01D57/02; C; C25; C25B; C25B7/00
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) | 1944-07-28 | 1945-01-27 | 1945-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-28 | 1949-01-27 | 1949-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-28 | 1953-01-27 | 1953-07-29 | $7700.00 | Window Closed / Lapsed |