US1789425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration process and apparatus
Assignee: ELECTRO DIALYZER Corp
•
Filing: 1928-05-05
•
Granted: 1931-01-20
•
Expires: 1948-05-05
Abstract
No abstract record available.
Inventors
- 👤 Charles T Cabrera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:11
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/333; B01D33/44; B01D33/48; B01D33/50
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1934-01-19 | 1934-07-21 | 1935-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-01-19 | 1938-07-21 | 1939-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-01-19 | 1942-07-21 | 1943-01-20 | $7700.00 | Window Closed / Lapsed |