Patent US2457057A successfully refreshed from Google Patents.
US2457057A
Expired / Lapsed
US
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Waste purification process and apparatus
Assignee: Individual
•
Filing: 1945-06-30
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Granted: 1948-12-21
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Expires: 1965-06-30
Abstract
No abstract record available.
Inventors
- 👤 Edward B Mallory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:47
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1221; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB218399A
Cited
US1904916A
Cited
US1982246A
Cited
US2089162A
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US2027670A
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US2077498A
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US2228017A
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US2154132A
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US2118266A
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USRE22144E
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US2337507A
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US2404223A
Cited
US2349390A
Cited
US2419492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |