US3211292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strainer with concentric filter elements
Assignee: Michigan Dynamics Inc
•
Filing: 1963-10-21
•
Granted: 1965-10-12
•
Expires: 1983-10-21
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Bull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:43
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/50; B01D29/52; B01D29/54; B01D29/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US590968A
Cited
GB473224A
Cited
US2301120A
Cited
US2382278A
Cited
CH262264A
Cited
US2521107A
Cited
US2926787A
Cited
US3045826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |