US3485380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter with ratchet retaining ring
Assignee: Walker Manufacturing Co
•
Filing: 1968-03-20
•
Granted: 1969-12-23
•
Expires: 1988-03-20
Abstract
No abstract record available.
Inventors
- 👤 Robert J Offer
- 👤 James C Mclaren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:32
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB358496A
Cited
US3300049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |