US2248177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for purifying water
Assignee: Individual
•
Filing: 1937-05-10
•
Granted: 1941-07-08
•
Expires: 1957-05-10
Abstract
No abstract record available.
Inventors
- 👤 Karlstrom Adolf Magnus Rupert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:32
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/24; B; B03; B03D; B03D1/00; B03D1/02; B03D1/028; B03D1/14; B03D1/1412; B03D1/1431; B03D1/1443; B03D1/1456; B03D1/1462
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) | 1944-07-07 | 1945-01-06 | 1945-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-07 | 1949-01-06 | 1949-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-07 | 1953-01-06 | 1953-07-08 | $7700.00 | Window Closed / Lapsed |