US3216575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for washing filter beds
Assignee: Xylem Water Solutions Zelienople LLC
•
Filing: 1961-03-08
•
Granted: 1965-11-09
•
Expires: 1981-03-08
Abstract
No abstract record available.
Inventors
- 👤 Fred E Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:12
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/46; B01D24/4668; B01D24/4673; B01D24/02; B01D24/20; B01D24/24; B01D24/4631; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7882; Y10T137/7886
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |