US3725538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of carbon from waste materials
Assignee: GARB-OIL Corp OF AMERICA A UT CORP
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Filing: 1970-04-20
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Granted: 1973-04-03
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Expires: 1990-04-20
Abstract
Abstract A waste materials processing system and method sometimes involving material recycling, which converts solid waste materials, such as household garbage, demolition debris, and so forth, to usable products such as carbon, ash as lightweight aggregate, metals, both ferrous and non-ferrous, and inert fill material. Various methods of separation techniques are applied to separate combustibles from non-combustibles, ferrous materials from non-ferrous materials, lights from heavies, and liquid from solids, to accomplished desired results. Floatation techniques are relied upon to accomplish essential separations as hereinafter described.
Inventors
- 👤 J Brewer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:21
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/06; B03B9/061; B03B9/065; C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/318; C01B32/324; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/58; Y10; Y10S; Y10S209/00; Y10S209/93; Y10S241/00; Y10S241/38; Y10S423/00; Y10S423/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A method of recovering carbon from non-sewage municipal waste comprising a variety of non-floatables and also floatable carbonaceous substances including the steps of collecting said waste, shredding the so collected waste, sink-float classifying and thereby separating said floatable carbonaceous substances from said non-floatables, wet-shredding said floatable carbonaceous substances, drying said floatable carbonaceous substances, charring said floatable carbonaceous substances to produce a carbon and ash-containing material, milling said material, and then subjecting to froth-flotation the so-milled material to separate carbon from the ash-containing residue thereof.
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |