US3400813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beneficiation of certain phosphate rock ores by froth flotation
Assignee: Mountain Fuel Supply Co
•
Filing: 1965-09-22
•
Granted: 1968-09-10
•
Expires: 1985-09-22
Abstract
No abstract record available.
Inventors
- 👤 Jay B Clitheroe
- 👤 Salvatore S Mele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:53
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA542489A
Cited
US1429550A
Cited
DE414175C
Cited
US1955039A
Cited
US2069182A
Cited
US1986816A
Cited
US2000656A
Cited
US3246748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |