US4474199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning or stripping of coated objects
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1982-11-09
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Granted: 1984-10-02
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Expires: 2002-11-09
Abstract
Abstract The present invention relates to the cleaning or stripping of coated objects. The coating is dissolved in a receiver tank rendered inert by means of nitrogen, by a solvent and the mixture of solvent and coating product is transferred into a thickening tank swamped by a heated nitrogen flow. The nitrogen-solvent mixture is separated by cooling and condensation of the solvents extracted. The invention is applied to the stripping of objects coated with paints and varnish.
Inventors
- 👤 Bernd Blaudszun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:33
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/04; B; B08; B08B; B08B7/00; B08B7/0064; B08B7/0092; B44; B44D; B44D3/00; B44D3/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
Apparatus for cleaning or stripping objects coated with varnish or paints, comprising: at least one receiver tank for receiving said objects; means for selectively sealingly closing said receiver tank; a tank of inert gas; an inert gas feed pipe having a first valve and connecting said receiver tank to said tank of inert gas; a stripping agent tank; a stripping agent feed pipe having a second valve and connecting said stripping agent tank to said receiver tank; an exhaust pipe having a third valve and connecting said receiver tank to atmosphere through a heat exchanger and a separator, said inert gas tank being connected to said receiver tank via said heat exchanger; and emptying means for selectively emptying said receiver tank.
Claim 2
Dependent Claim
121 words
Apparatus for cleaning or stripping objects coated with varnish or paints, comprising: at least one receiver tank for receiving said objects; means for selectively sealingly closing said receiver tank; a tank of inert gas; an inert gas feed pipe having a first valve and connecting said receiver tank to said tank of inert gas; a stripping agent tank; a stripping agent feed pipe having a second valve and connecting said stripping agent tank to said receiver tank; an exhaust pipe having a third valve and connecting said receiver tank to atmosphere through a heat exchanger and a separator, said inert gas tank being connected to said receiver tank via said heat exchanger; and emptying means for selectively emptying said receiver tank.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1, wherein a first pump is provided in said stripping agent feed pipe and said emptying means comprise a second pump.
Claim 4
Dependent Claim
71 words
Apparatus according to claim 1, further comprising at least one thickening tank which is connected to said receiving tank through said emptying means; a conduit having a fourth valve and connecting said inert gas tank to said thickening tank; a discharge pipe connecting an upper part of said thickening tank to a second separator via a second heat exchanger; and means for supplying a refrigerant fluid to said second heat exchanger.
Claim 5
Dependent Claim
17 words
Apparatus according to claim 3, wherein said second heat exchanger comprises an evaporator of a refrigerating set.
Claim 6
Dependent Claim
27 words
Apparatus acccording to claim 3, further comprising a return pipe for returning inert gas freed of condensed stripping agent from said second separator into said thickening tank.
Claim 7
Dependent Claim
15 words
Apparatus according to claim 5, wherein a heating device is installed on said return pipe.
Claim 8
Dependent Claim
14 words
Apparatus according to claim 3, wherein a blower is installed in said discharge pipe.
Claim 9
Dependent Claim
22 words
Apparatus according to claim 5, wherein said discharge pipe and said return pipe are disposed in heat exchange relationship in a recuperator.
Claim 10
Dependent Claim
27 words
Apparatus according to claim 3, wherein liquid outlets of said separators are connected to said stripping agent tank via stripping agent return means comprising a third pump.
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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |