US3022247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for treating water and method
Assignee: Dean Manufacturing Inc
•
Filing: 1957-07-26
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Granted: 1962-02-20
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Expires: 1977-07-26
Abstract
No abstract record available.
Inventors
- 👤 Ernest E Selby
- 👤 Rufus R Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:28
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/18; C23F11/184; B; B01; B01F; B01F21/00; B01F21/20; B01F21/22; Y; Y10; Y10T; Y10T137/00; Y10T137/402; Y10T137/4891
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US743006A
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US1165608A
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US1191628A
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US2083076A
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US2304626A
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US2503878A
Cited
US2649203A
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US2623014A
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US2891622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |