US2818328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of powdered iron
Assignee: Individual
•
Filing: 1954-07-28
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Granted: 1957-12-31
•
Expires: 1974-07-28
Abstract
No abstract record available.
Inventors
- 👤 Charles B Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:04
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22; C; C21; C21B; C21B13/00; C21B13/0086; C21B13/04; C21B15/00; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
THE METHOD OF DISPOSING OF SULPHURIC PICKLE LIQUOR THAT COMPRISES IRON SULPHATE AND OTHER SALTS AND IMPURITIES IN SOLUTION, SAID METHOD COMPRISING THE STEPS OF EVAPORATING THE EXCESS WATER FROM THE SOLUTION AND FORMING IRON SULPHATE CRYSTALS, HEATING AND AGITATING THE CRYSTALS TO DRIVE OFF THE WATER OF CRYSTALLIZATION AND PROVIDE IRON SULPHATE IN FINELY DIVIDED FORM, EXPOSING THE LATTER IRON SULPHATE AT AN ELEVATED CHEMICAL-REACTION TEMPERATURE TO THE ACTION OF HYDROGEN AND THEREBY PRODUCING IRON POWDER, WITH AN ACCOMPANYING RELEASE OF SULPHUR DIOXIDE AND WATER VAPOR, SEPARATING THE IRON
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |