Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Liquid composition
Reexamination Certificate
2000-10-03
2002-08-13
Webb, Gregory E. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Liquid composition
C510S411000, C134S111000, C134S022100
Reexamination Certificate
active
06432903
ABSTRACT:
BACKGROUND
The present invention relates generally to solvents used for flushing air conditioning systems and, in an embodiment described herein, more particularly provides an air conditioning system flush solvent having enhanced effectiveness.
There are many circumstances in which an air conditioning system may be flushed with a solvent. For example, after failure of a component, such as a compressor, the air conditioning system may be flushed to remove debris from the system. The retrofitting of R-12 systems to use R-134a refrigerant generally requires the removal of mineral oil from the system, since mineral oil is used as a lubricant in R-12 systems, but is incompatible with R-134a. Additionally, the removal of excess oil and sludge in any system may be accomplished by flushing the air conditioning system with an appropriate solvent.
Another important benefit may be achieved by flushing an air conditioning system with a solvent. That benefit is the removal of moisture from the system. As is well known, moisture in an air conditioning system reduces the efficiency of the system.
Unfortunately, past air conditioning flush solvents have not been formulated specifically for enhanced effectiveness in removing moisture from air conditioning systems. For example, one known air conditioning solvent includes almost 75% heptane, approximately 5% fragrance and less than 25% isopropyl alcohol.
Therefore, it may be seen that it would be quite desirable to provide an air conditioning flush solvent which is particularly effective in removing moisture from air conditioning systems. It is an object of the present invention to provide such an air conditioning flush solvent.
SUMMARY
In carrying out the principles of the present invention, in accordance with an embodiment thereof, an air conditioning flush solvent is provided which has enhanced effectiveness in removing moisture from air conditioning systems. Associated methods of flushing air conditioning systems are also provided.
In one aspect of the invention, an air conditioning flush solvent is provided which comprises 69.5% heptane, 29.5% isopropyl alcohol and 1% fragrance. An increased proportion of isopropyl alcohol enhances the effectiveness of the flush solvent in removing moisture from an air conditioning system.
In another aspect of the invention, an air conditioning flush solvent is provided which consists essentially of 60-70% heptane and 29-40% isopropyl alcohol. The flush solvent may also include up to 1% fragrance.
These and other features, advantages, benefits and objects of the present invention will become apparent to one of ordinary skill in the art upon careful consideration of the detailed description of a representative embodiment of the invention hereinbelow.
DETAILED DESCRIPTION
All proportions described herein are by volume percent.
The inventor has discovered a formulation for an air conditioning flush solvent which accomplishes the traditional objectives of removing debris, oil and sludge from an air conditioning system, while having particular effectiveness in removing moisture from the system. Preferably, the formulation is 69.5% heptane, 29.5% isopropyl alcohol and 1% fragrance, although these proportions may be varied somewhat without departing from the principles of the present invention.
For example, the proportion of heptane may be from approximately 60% to approximately 70%. The proportion of isopropyl alcohol may be from approximately 29% to approximately 40%. The proportion of fragrance may be from 0% to approximately 1%.
For achieving the above objectives of the invention, the inventor prefers that the air conditioning flush solvent have a proportion of heptane less than or equal to 70% and a proportion of isopropyl alcohol greater than or equal to 29%.
The inventor has found that the above-described air conditioning flush solvent is useful in flushing air conditioning systems, is compatible with commonly used refrigerants and has enhanced effectiveness in removing moisture from air conditioning systems. In practice, the air conditioning system flush solvent is forced through the air conditioning system, or individual components thereof. Debris, oil, sludge and moisture are removed from the air conditioning system by the flush solvent.
REFERENCES:
patent: 1636512 (1927-07-01), Hilger
patent: 2249622 (1941-07-01), Schlumbohm
patent: 2321964 (1943-06-01), Zieber
patent: 2475218 (1949-07-01), Campbell
patent: 3665053 (1972-05-01), Mizutani et al.
patent: 3908650 (1975-09-01), Dunshee et al.
patent: 4167102 (1979-09-01), Willitts
patent: 4285206 (1981-08-01), Koser
patent: 4304102 (1981-12-01), Gray
patent: 4768347 (1988-09-01), Manz et al.
patent: 4805416 (1989-02-01), Manz et al.
patent: 4809520 (1989-03-01), Manz et al.
patent: 4982578 (1991-01-01), Heffner et al.
patent: 5005375 (1991-04-01), Manz et al.
patent: 5078756 (1992-01-01), Major et al.
patent: 5243831 (1993-09-01), Major et al.
Konneker & Smith P.C.
Konneker, Esq. J. Richard
Smith, Esq. Marlin R.
Technical Chemical Company
Webb Gregory E.
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