Patent US4744770A successfully refreshed from Google Patents.
US2887451A
Expired / Lapsed
US
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Separation process using fly ash
Assignee: EIDP Inc
•
Filing: 1954-03-19
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Granted: 1959-05-19
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Expires: 1974-03-19
Abstract
No abstract record available.
Inventors
- 👤 James H Hill
- 👤 William C Moser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:40
CPC Classifications
D; D01; D01F; D01F13/00; D01F13/02; Y; Y02; Y02P; Y02P70/00; Y02P70/50; Y02P70/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A PROCESS COMPRISING CONTACING WITH FLY ASH AN AQUEOUS MEDIUM CONTAINING HEMICELLULOSE AND SEPARATING THE TREATED AQUEOUS MEDIUM FROM THE FLY ASH.
Claim 2
Dependent Claim
22 words
A PROCESS COMPRISING CONTACING WITH FLY ASH AN AQUEOUS MEDIUM CONTAINING HEMICELLULOSE AND SEPARATING THE TREATED AQUEOUS MEDIUM FROM THE FLY ASH.
References Cited (Backward Citations)
US2225024A
Cited
GB698943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |