Patent US2422180A successfully refreshed from Google Patents.
Patent US1450560A successfully refreshed from Google Patents.
US1450560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation and filter system and apparatus
Assignee: —
•
Filing: —
•
Granted: 1923-04-03
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Expires: 1940-04-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:24
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/02; B01J; B01J20/00; B01J20/02; B01J20/06
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) | 1926-04-02 | 1926-10-02 | 1927-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1930-04-02 | 1930-10-02 | 1931-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1934-04-02 | 1934-10-02 | 1935-04-03 | $7700.00 | Window Closed / Lapsed |