Patent US5112303A successfully refreshed from Google Patents.
US2772947A
Expired / Lapsed
US
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Process for converting nickel sulfide to nickel sulfate
Assignee: Wigton-Abbott Corp
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Filing: 1951-03-23
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Granted: 1956-12-04
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Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Elbert O Sowerwine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:05
CPC Classifications
C; C01; C01G; C01G53/00; C01G53/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
THE PROCESS FOR CONVERTING NICKEL SULFIDE TO NICKEL SULFATE THAT COMPRISES HEATING NICKEL SULFIDE AT A MODERATELY ELEVATED TEMPERATURE NOT IN EXCESS OF ABOUT 400* C. IN AN ATMOSPHERE CONTAINING IN EXCESS OF 80% SULFUR DIOXIDE AND ABOUT 3 TO 10% OF OXYGEN, WHILE MAINTAINING A SUPERATMOSPHERIC PRESSURE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |