US2732940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Froth flotation process
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
•
Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:23
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D2201/00; B03D2201/04; B03D2203/00; B03D2203/02; B03D2203/025; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A METHOD OF EFFECTING THE CONCENTRATION OF MINERALS BY FLOTATION WHICH COMPRISES THE STEP OF ADDING TO THE MINERAL PULP, IN THE CAPACITY OF A FROTHING AGENT, A PHTHALIC ACID DIESTER OF A LOWER ALKOXY ALKANOL OF TWO TO THREE CARBON ATOMS.
Claim 2
Independent Claim
42 words
A METHOD OF EFFECTING THE CONCENTRATION OF MINERALS BY FLOTATION WHICH COMPRISES THE STEP OF ADDING TO THE MINERAL PULP, IN THE CAPACITY OF A FROTHING AGENT, A PHTHALIC ACID DIESTER OF A LOWER ALKOXY ALKANOL OF TWO TO THREE CARBON ATOMS.
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) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |