US3050240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal contaminant extractor
Assignee: DYNAMIC FILTERS Inc
•
Filing: 1958-03-28
•
Granted: 1962-08-21
•
Expires: 1978-03-28
Abstract
No abstract record available.
Inventors
- 👤 Rex C Darnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:53
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/04; B04B1/06; Y; Y10; Y10S; Y10S494/00; Y10S494/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189813464A
Cited
US1417064A
Cited
US1619652A
Cited
FR703182A
Cited
US2450737A
Cited
US2540474A
Cited
US2691944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |