US2635757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water clarification apparatus and method
Assignee: Walker Process Equipment Inc
•
Filing: 1950-03-16
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Granted: 1953-04-21
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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 18:28
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281
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) | 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 |