US1533032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purifying, filtering, and separating apparatus and process
Assignee: Individual
•
Filing: 1920-03-05
•
Granted: 1925-04-07
•
Expires: 1940-03-05
Abstract
No abstract record available.
Inventors
- 👤 Sauer Johan Nicolaas Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:38
CPC Classifications
B; B01; B01D; B01D37/00; B01D21/00; B01D21/0012; B01D21/26; B01D29/00; B01D33/00; B01D21/262; B01D33/06; B01D37/02
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) | 1928-04-06 | 1928-10-06 | 1929-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-04-06 | 1932-10-06 | 1933-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-04-06 | 1936-10-06 | 1937-04-07 | $7700.00 | Window Closed / Lapsed |