Patent US3710939A successfully refreshed from Google Patents.
US3710939A
Expired / Lapsed
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Frothing agents for the floatation of ores
Assignee: Dow Chemical Co
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Filing: 1970-06-15
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Granted: 1973-01-16
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Expires: 1990-06-15
Abstract
Abstract Polyoxypropylene adducts of glycerine, hexanetriol, diglycerol, sorbitol, pentaerythritol, a monosaccharide, a disaccharide or mixture thereof having at least about 5 or more oxypropylene units and a molecular weight below about 2,100 have been discovered to be excellent frothing agents for the floatation of ores.
Inventors
- 👤 J Hostynek
- 👤 D Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:29
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2603; C08G65/2606; B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/008; B03D1/012; B03D2201/00; B03D2201/02; B03D2201/04; B03D2203/00; B03D2203/02; Y; Y10; Y10S; Y10S209/00; Y10S209/901
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
19 words
The process of claim 1 wherein the frothing agent is a polyoxypropylene adduct of glycerine, sucrose or mixture thereof.
Claim 2
Dependent Claim
15 words
The process of claim 2 wherein the ore is a copper, lead, or zinc ore.
Claim 3
Dependent Claim
13 words
The process of claim 3 wherein the ore is a copper sulfide ore.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |