US2572971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid clarifier
Assignee: —
•
Filing: —
•
Granted: 1951-10-30
•
Expires: 1968-10-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:15
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D29/23; B01D29/44; B01D29/48; B01D29/50; B01D29/52; B01D29/54; B01D29/56; B01D29/58; B01D35/00; B01D35/14; B01D35/147; C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US591006A
Cited
US1246850A
Cited
US1328045A
Cited
US1906417A
Cited
US2230174A
Cited
US2447680A
Cited
US2401039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |