US3472380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bidirectional filter device
Assignee: Parker Hannifin Corp
•
Filing: 1966-12-27
•
Granted: 1969-10-14
•
Expires: 1986-12-27
Abstract
No abstract record available.
Inventors
- 👤 Nils O Rosaen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:47
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/96; B01D35/00; B01D35/14; B01D35/143; B01D35/147; B01D35/15; Y; Y10; Y10S; Y10S116/00; Y10S116/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3289841A
Cited
US3244282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |