Patent US2423356A successfully refreshed from Google Patents.
Patent US3009577A successfully refreshed from Google Patents.
US3009577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water softener screen
Assignee: Individual
•
Filing: 1957-02-05
•
Granted: 1961-11-21
•
Expires: 1977-02-05
Abstract
No abstract record available.
Inventors
- 👤 Frederick D Gugeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:30
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US429688A
Cited
US1747470A
Cited
US2536196A
Cited
US2627503A
Cited
US2664373A
Cited
US2695255A
Cited
US2771320A
Cited
US2809158A
Cited
US2773829A
Cited
US2768750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-20 | 1965-05-22 | 1965-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-20 | 1969-05-22 | 1969-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-20 | 1973-05-22 | 1973-11-21 | $7700.00 | Window Closed / Lapsed |