US4817652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for surface and fluid cleaning
Assignee: University of Minnesota System
•
Filing: 1987-03-26
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Granted: 1989-04-04
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Expires: 2007-03-26
Abstract
Abstract A cleaning system of the apparatus utilizing the effect of surface tension forces (4) and phase changes between a liquid and gas. In one embodiment the surface (21) to be cleaned is submerged within a vessel (30), the pressure within the vessel being increased. A rapid depressurization of the vessel causes a plurality of bubbles (12) to form around undesired particulate matter (13) on the surface (14) of the article to be cleaned, the bubbles rising to the surface of the liquid (27) within the chamber, thereby cleaning the article. A second embodiment utilizes a cleaning fluid (52) which is applied to the surface of the article (49) to be cleaned. The fluid being subsequently frozen on the surface, thereby reducing the adhesion force between the surface of the article and undesired particulate matter. The surface of the article (49) is subsequently heated, and the undesired particulate matter is removed through the medium of the cleaning fluid (52).
Inventors
- 👤 Benjamin Y. H. Liu
- 👤 Kang H. Ahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:44
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0402; H10P72/0406; H10P72/0411; H10P72/0414; B; B08; B08B; B08B3/00; B08B3/04; B08B3/10; B08B3/102; B08B7/00; B08B7/0064; Y; Y10; Y10S; Y10S134/00; Y10S134/902
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
197 words
A system for cleaning a surface, comprising: (a) a pressure vessel, the pressure vessel being suitably configured so as to house the surface; (b) a cleaning fluid within the pressure vessel of sufficient depth such that the surface is submerged in the cleaning fluid; (c) means for introducing a gas into the cleaning fluid so as to achieve a desired pressure within the pressure vessel, wherein the desired pressure is dependent upon the gas, the surface and the cleaning fluid; (d) a pressure relief valve movable between a first open position and a second closed position, wherein movement of the valve from the closed position to the open position causes a substantially instantaneous decrease in the desired pressure within the pressure vessel such that bubbles spontaneously form within the cleaning fluid, the bubbles tending to form around contaminants on the surface, the bubbles tending to remove the contaminants from the surface and suspend the contaminants within the cleaning fluid; and (e) a drain, the drain permitting the cleaning fluid to be removed from the pressure vessel, thereby simultaneously removing the suspended contaminants from the pressure vessel such that a relatively clean surface remains within the pressure vessel.
Claim 2
Independent Claim
197 words
A system for cleaning a surface, comprising: (a) a pressure vessel, the pressure vessel being suitably configured so as to house the surface; (b) a cleaning fluid within the pressure vessel of sufficient depth such that the surface is submerged in the cleaning fluid; (c) means for introducing a gas into the cleaning fluid so as to achieve a desired pressure within the pressure vessel, wherein the desired pressure is dependent upon the gas, the surface and the cleaning fluid; (d) a pressure relief valve movable between a first open position and a second closed position, wherein movement of the valve from the closed position to the open position causes a substantially instantaneous decrease in the desired pressure within the pressure vessel such that bubbles spontaneously form within the cleaning fluid, the bubbles tending to form around contaminants on the surface, the bubbles tending to remove the contaminants from the surface and suspend the contaminants within the cleaning fluid; and (e) a drain, the drain permitting the cleaning fluid to be removed from the pressure vessel, thereby simultaneously removing the suspended contaminants from the pressure vessel such that a relatively clean surface remains within the pressure vessel.
Claim 3
Dependent Claim
14 words
The system of claim 1, wherein the cleaning fluid is deionized and filtered water.
Claim 4
Dependent Claim
11 words
The system of claim 1, wherein the gas is carbon dioxide.
Claim 5
Dependent Claim
11 words
The system of claim 1, wherein the gas is compressed air.
Claim 6
Dependent Claim
10 words
The system of claim 1, wherein the gas is nitrogen.
Claim 7
Dependent Claim
16 words
The system of claim 1, wherein the gas is a mixture of carbon dioxide and air.
Claim 8
Dependent Claim
16 words
The system of claim 1, wherein the gas is a mixture of carbon dioxide and nitrogen.
References Cited (Backward Citations)
US1097099A
Cited
US1409588A
Cited
US1907455A
Cited
US2009278A
Cited
US3166445A
Cited
US3410724A
Cited
US3655172A
Cited
US3733710A
Cited
US3799179A
Cited
US4266982A
Cited
US4226642A
Cited
US4305413A
Cited
JPS57204132A
Cited
JPS58141527A
Cited
US4628616A
Cited
JPS60165727A
Cited
JPS6118958A
Cited
JPS6160799A
Cited
JPS61131459A
Cited
JPS62173720A
Cited
JPS62195129A
Cited
JPS6310529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |