US3772082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor degreasing process
Assignee: Dow Chemical Co
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Filing: 1972-04-03
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Granted: 1973-11-13
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Expires: 1992-04-03
Abstract
Abstract A novel method and apparatus for degreasing metals. The method comprises introducing the soiled metal into hot solvent or vapors of a solvent, separating the solids, transporting and vaporizing a portion of the solvent and returning the vapors and hot solvent to the cleaning zone. The improved apparatus has means for removing the particulate soil from the cleaning zone, means for generating hot solvent and vapors independent of the cleaning zone but integral with the apparatus, a means for removing oils, greases, and the like from the solvent and means for returning the solvent in a clean condition to the cleaning zone.
Inventors
- 👤 J Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:05
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
189 words
In a method for cleaning metal parts to degrease said part and to remove grinding compounds, polishing compounds, and the like, as well as remove metal fines, turnings, and the like, wherein said metal is contacted with hot liquid and/or hot vapors of said solvent in a cleaning zone, the improvement which comprises continuously removing a portion of the liquid solvent from said cleaning zone, separating the solvent from particulate solids, passing said separated solvent into a conduit, having its outlet above its inlet, heating said solvent in said conduit to convert at least a part of said solvent into vapor, thereby moving liquid and solvent vapor upwardly through said conduit and returning the same to the cleaning zone, and additionally of removing continuously or intermittently from the upper end of said conduit a portion of the liquid and directing this so-removed portion into a second conduit, vaporizing the solvent from said liquid in a vaporizing zone of said second conduit, returning the solvent vapors to said cleaning zone, and removing from said vaporizing zone of said second conduit contaminants which have a higher boiling point than said solvent.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |