US2444774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of raw waters
Assignee: PQ Corp
•
Filing: 1943-11-03
•
Granted: 1948-07-06
•
Expires: 1963-11-03
Abstract
No abstract record available.
Inventors
- 👤 Harold R Hay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:10
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1997114A
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US1989380A
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GB451826A
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US2234285A
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US2217466A
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GB499247A
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US2267831A
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US2310009A
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US2241641A
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US2307466A
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US2310655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-06 | 1952-01-05 | 1952-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-06 | 1956-01-05 | 1956-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-06 | 1960-01-05 | 1960-07-06 | $7700.00 | Window Closed / Lapsed |