US5354384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cleaning surface by heating and a stream of snow
Assignee: Raytheon Co
•
Filing: 1993-04-30
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Granted: 1994-10-11
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Expires: 2013-04-30
Abstract
Abstract An improved apparatus and method for removing trace contaminants from the surface of a chosen substrate, such as delicate surfaces or precision parts, wherein the improvement consists of heating a portion of a chosen substrate surface immediately before, during and/or after application of a stream of cleaning snow to the same portion of the substrate surface.
Inventors
- 👤 John D. Sneed
- 👤 Wilfried Krone-Schmidt
- 👤 Michael J. Slattery
- 👤 Howard S. Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:36
CPC Classifications
B; B08; B08B; B08B7/00; B08B7/0064; H; H05; H05K; H05K3/00; H05K3/22; H05K3/26
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
104 words
In a method for cleaning the surface of substrates wherein a stream of cleaning snow is directed against a portion of a substrate surface to remove contaminants located thereon, the improvement comprising the step of heating with heating gas said portion of the substrate surface before application of said stream of cleaning snow to said portion of said substrate surface to a first elevated temperature which is above the temperature of said cleaning snow or after application of said stream of cleaning snow to said portion of said substrate surface to a second elevated temperature which is above the dew point of ambient vapors.
Claim 2
Dependent Claim
104 words
In a method for cleaning the surface of substrates wherein a stream of cleaning snow is directed against a portion of a substrate surface to remove contaminants located thereon, the improvement comprising the step of heating with heating gas said portion of the substrate surface before application of said stream of cleaning snow to said portion of said substrate surface to a first elevated temperature which is above the temperature of said cleaning snow or after application of said stream of cleaning snow to said portion of said substrate surface to a second elevated temperature which is above the dew point of ambient vapors.
Claim 3
Dependent Claim
31 words
The method of claim 1 comprising the step of heating a portion of the substrate surface before application of said stream of cleaning snow to said portion of said substrate surface.
Claim 4
Dependent Claim
31 words
The method of claim 1 comprising the step of heating said portion of said substrate surface after application of said stream of cleaning snow to said portion of said substrate surface.
Claim 5
Dependent Claim
37 words
The method of claim 2 wherein said portion of said substrate surface is heated to a first elevated temperature which is sufficient to enhance removal of contaminants from said portion of said substrate without damaging said substrate.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein said first elevated temperature ranges between 20 and 160 degrees centigrade.
Claim 7
Dependent Claim
23 words
The method of claim 5 wherein said cleaning snow is selected from the group of substances including nitrogen, carbon dioxide, argon and neon.
Claim 8
Dependent Claim
12 words
The method of claim 6 wherein said cleaning snow comprises carbon dioxide.
Claim 9
Dependent Claim
17 words
The method of claim 7 wherein said first elevated temperature is between 40 and 60 degrees centigrade.
Claim 10
Dependent Claim
32 words
The method of claim 2 further comprising the step of reheating said portion of said substrate surface after application of said stream of cleaning snow to said portion of said substrate surface.
Claim 11
Dependent Claim
35 words
The method of claim 9 wherein said portion of said substrate surface is reheated to a second elevated temperature which is sufficient to inhibit the formation of condensates on said portion of said substrate surface.
Claim 12
Dependent Claim
23 words
The method of claim 10 wherein said second elevated temperature is at least 20 degrees centigrade above the dew point for ambient vapors.
Claim 13
Dependent Claim
36 words
The method of claim 2 comprising the step of applying a first stream of heating gas to said portion of said substrate before application of said stream of cleaning snow to said portion of said substrate.
Claim 14
Dependent Claim
60 words
The method of claim 12 further comprising the step of reheating said portion of said substrate surface after application of said stream of cleaning snow to said portion of said substrate surface by applying a second stream of heating gas to said portion of said substrate after application of said stream of cleaning snow to said portion of said substrate.
Claim 15
Dependent Claim
24 words
The method of claim 13 wherein said cleaning gas is selected from the group of substances including nitrogen, carbon dioxide, dry air and argon.
Claim 16
Dependent Claim
104 words
In a method for cleaning the surface of substrates wherein a stream of cleaning snow is directed against a portion of a substrate surface to remove contaminants located thereon, the improvement comprising the step of heating with heating gas said portion of the substrate surface before application of said stream of cleaning snow to said portion of said substrate surface to a first elevated temperature which is above the temperature of said cleaning snow and after application of said stream of cleaning snow to said portion of said substrate surface to a second elevated temperature which is above the dew point of ambient vapors.
Claim 17
Dependent Claim
104 words
In a method for cleaning the surface of substrates wherein a stream of cleaning snow is directed against a portion of a substrate surface to remove contaminants located thereon, the improvement comprising the step of heating with heating gas said portion of the substrate surface before application of said stream of cleaning snow to said portion of said substrate surface to a first elevated temperature which is above the temperature of said cleaning snow and after application of said stream of cleaning snow to said portion of said substrate surface to a second elevated temperature which is above the dew point of ambient vapors.
Claim 18
Dependent Claim
29 words
The method of claim 15 further comprising the step of heating said portion of said substrate surface during application of said stream of cleaning snow to said substrate surface.
References Cited (Backward Citations)
US4655847A
Cited
US4977910A
Cited
US4631250A
Cited
US4806171A
Cited
US5035750A
Cited
US5094696A
Cited
US4962891A
Cited
US5147466A
Cited
US5062898A
Cited
US5125979A
Cited
US5217925A
Cited
US5108512A
Cited
US5209028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-10 | 1998-04-11 | 1998-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-10 | 2002-04-11 | 2002-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-10 | 2006-04-11 | 2006-10-11 | $7700.00 | Window Closed / Lapsed |