Patent US2635757A successfully refreshed from Google Patents.
US2635757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water clarification apparatus and method
Assignee: Walker Process Equipment Inc
•
Filing: 1950-03-16
•
Granted: 1953-04-21
•
Expires: 1970-03-16
Abstract
No abstract record available.
Inventors
- 👤 Walker James Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:09
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1851684A
Cited
US2021304A
Cited
US2098467A
Cited
US2143750A
Cited
US2291772A
Cited
US2279970A
Cited
US2368703A
Cited
US2411386A
Cited
US2370356A
Cited
US2419004A
Cited
US2444671A
Cited
US2525842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |