US2528879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clarifying apparatus
Assignee: INFILEO Inc
•
Filing: 1946-07-27
•
Granted: 1950-11-07
•
Expires: 1966-07-27
Abstract
No abstract record available.
Inventors
- 👤 Walter H Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:46
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0018; B01D21/02; B01D21/04; B01D21/06; B01D21/08; B01D21/18; B01D21/20; B01D21/24; B01D21/2405; B01D21/2411
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2296437A
Cited
US2382490A
Cited
US2348123A
Cited
US2391738A
Cited
US2400598A
Cited
US2427886A
Cited
US2427091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |