US4141373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for deoiling metal scrap
Assignee: Rjr Archer Inc
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Filing: 1977-09-28
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Granted: 1979-02-27
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Expires: 1997-09-28
Abstract
Abstract This invention relates to a method of removing oil from metal scrap, comprising the steps of introducing oil-laden scrap into a hermetically sealed chamber, evacuating said chamber, heating said scrap to vaporize the oil, and removing the vaporized oil from said chamber.
Inventors
- 👤 John M. Kartanson
- 👤 Robert M. Neel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:26
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/005; C23; C23G; C23G5/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S266/00; Y10S266/901; Y10T; Y10T29/00; Y10T29/49; Y10T29/49751; Y10T29/49755; Y10T29/49757
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A method of removing oil from metal scrap, comprising the steps of: (a) introducing an oil laden scrap into a hermetically sealable chamber; (b) evacuating said chamber; (c) introducing an inert gas into said chamber after evacuation to flush the chamber of air; (d) heating said inert gas within said chamber until the scrap metal is raised to a selected temperature; (e) reducing the pressure in said chamber after the metal has obtained the selected temperature by withdrawing the chamber atmosphere which includes a mixture of inert gas and vaporized oil; and (f) continuously introducing the inert gas into the chamber as the atmosphere within the chamber is being withdrawn.
Claim 2
Independent Claim
110 words
A method of removing oil from metal scrap, comprising the steps of: (a) introducing an oil laden scrap into a hermetically sealable chamber; (b) evacuating said chamber; (c) introducing an inert gas into said chamber after evacuation to flush the chamber of air; (d) heating said inert gas within said chamber until the scrap metal is raised to a selected temperature; (e) reducing the pressure in said chamber after the metal has obtained the selected temperature by withdrawing the chamber atmosphere which includes a mixture of inert gas and vaporized oil; and (f) continuously introducing the inert gas into the chamber as the atmosphere within the chamber is being withdrawn.
Claim 3
Dependent Claim
29 words
The method of claim 1, wherein said heating step further includes increasing the amount of inert gas in said chamber while maintaining a slight negative pressure within said chamber.
Claim 4
Dependent Claim
25 words
The method of claim 1, further including the steps of reducing the temperature of the scrap metal prior to returning the chamber to atmospheric pressure.
Claim 5
Dependent Claim
36 words
The method of claim 3, wherein the step of reducing the temperature of said heated scrap metal includes: (a) cooling the gas within the chamber; and (b) circulating the cooled gas around the heated metal scrap.
Claim 6
Dependent Claim
11 words
The method of claim 1, wherein said inert gas is nitrogen.
Claim 7
Dependent Claim
17 words
The method of claim 1, wherein said metal scrap is heated to between 150° and 1100° F.
Claim 8
Dependent Claim
14 words
The method of claim 1, wherein said selected temperature is at least 500° F.
Claim 9
Independent Claim
141 words
A method of removing oil from oil-laden metal scrap comprising the steps of: (a) introducing said oil-laden scrap into the hermetically sealable chamber; (b) evacuating the chamber to remove the air; (c) flushing said chamber with an inert gas; (d) raising the temperature of the said metal scrap to a selected level by heating the inert gas and circulating said heated gas around the scrap metal; (e) during said heating step, increasing the amount of inert gas in the chamber while maintaining a slightly negative pressure within said chamber; (f) after said scrap has attained said selected temperature, reducing the pressure in said chamber, whereby the sensible heat of the scrap metal and oil will vaporize the majority of said oil; and (g) removing the majority of the vaporized oil from said chamber as the pressure in the chamber is reduced.
Claim 10
Independent Claim
141 words
A method of removing oil from oil-laden metal scrap comprising the steps of: (a) introducing said oil-laden scrap into the hermetically sealable chamber; (b) evacuating the chamber to remove the air; (c) flushing said chamber with an inert gas; (d) raising the temperature of the said metal scrap to a selected level by heating the inert gas and circulating said heated gas around the scrap metal; (e) during said heating step, increasing the amount of inert gas in the chamber while maintaining a slightly negative pressure within said chamber; (f) after said scrap has attained said selected temperature, reducing the pressure in said chamber, whereby the sensible heat of the scrap metal and oil will vaporize the majority of said oil; and (g) removing the majority of the vaporized oil from said chamber as the pressure in the chamber is reduced.
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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) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |