US3540880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the precipitation of substances from solution,using solid precipitants
Assignee: Kennecott Corp
•
Filing: 1967-06-14
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Granted: 1970-11-17
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Expires: 1987-06-14
Abstract
No abstract record available.
Inventors
- 👤 Henry Rush Spedden
- 👤 Emil Edward Malouf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:25
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/02; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US981098A
Cited
US1071447A
Cited
US2978300A
Cited
US3154411A
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US3249263A
Cited
US3333953A
Cited
US3432348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |