US2489682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element
Assignee: Equipment Dev Co Inc
•
Filing: 1948-03-01
•
Granted: 1949-11-29
•
Expires: 1968-03-01
Abstract
No abstract record available.
Inventors
- 👤 Edmund G Smith
- 👤 Otell M Cocchiarella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:09
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US539800A
Cited
US679131A
Cited
US1148237A
Cited
US1256830A
Cited
GB169591A
Cited
US1965816A
Cited
US2113923A
Cited
US2346682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |