Patent US4745772A successfully refreshed from Google Patents.
US4745772A
Expired / Lapsed
US
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Air conditioner auxiliary filter/drier refrigerant and chemical additive transfer device
Assignee: Individual
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Filing: 1987-04-20
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Granted: 1988-05-24
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Expires: 2007-04-20
Abstract
Abstract A portable air conditioner drier and chemical additive system feeder particularly useful for home and auto air conditioning systems. The unit is an in-line filter/drier with an input flexible line section and an output flexible line section connectable from a system high pressure fitting to the refrigerant system suction side valve fitting so that a portion of the system pumps high pressure gas output through the filter/drier for a short contaminant, moisture, and air removal running period of time generally to an extent of twenty to forty minutes. The filter/drier unit includes a screw top container that seals against leakage when threaded down normally containing a screen and filter material with a fill of desiccant particles cartridge which can be removed and replaced. With the filter desiccant cartridge removed and the container top open chemical additive fluids may be poured in with the unit attached to the low pressure fitting, the top threaded down again and the high pressure side reconnected to the system high pressure fitting or to a refrigerant material supply can to force flow the chemical additive fluids to the air conditioning system. A high pressure fitting adapter is used on the input flexible line section for connection to a system high pressure valve fitting of some systems.
Inventors
- 👤 James E. Ferris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:54
CPC Classifications
F; F25; F25B; F25B43/00; F25B43/003
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
200 words
An air conditioner refrigerant auxiliary filter/drier unit comprising: a screw top cylindrical container that may be opened and closed with a screw top that seals the container against leakage when threaded down; a fluid inlet transfer line connected to said screw top for the feeding of fluid through opening means in said screw top and extended to a screw on fitting connectable to a high pressure fitting of an air conditioning system; an opening connection at the bottom of said screw top cylindrical container; a fluid outlet transfer line connected to said opening connection and extended to a screw on fitting connectable to a low pressure fitting of an air conditioning system; and desiccant containing filter screen member placeable in said screw top cylindrical container; wherein said desiccant containing filter screen member is a cup shaped member that when placed in said screw top cylindrical container occupies substantially the internal length of said screw top cylindrical container; an "O" ring seal is positioned between the top rim of said screw top cylindrical container and the inside top surface of said screw top; and wherein a disc of screening material is positioned inside said screw top and above said "O" ring.
Claim 2
Dependent Claim
200 words
An air conditioner refrigerant auxiliary filter/drier unit comprising: a screw top cylindrical container that may be opened and closed with a screw top that seals the container against leakage when threaded down; a fluid inlet transfer line connected to said screw top for the feeding of fluid through opening means in said screw top and extended to a screw on fitting connectable to a high pressure fitting of an air conditioning system; an opening connection at the bottom of said screw top cylindrical container; a fluid outlet transfer line connected to said opening connection and extended to a screw on fitting connectable to a low pressure fitting of an air conditioning system; and desiccant containing filter screen member placeable in said screw top cylindrical container; wherein said desiccant containing filter screen member is a cup shaped member that when placed in said screw top cylindrical container occupies substantially the internal length of said screw top cylindrical container; an "O" ring seal is positioned between the top rim of said screw top cylindrical container and the inside top surface of said screw top; and wherein a disc of screening material is positioned inside said screw top and above said "O" ring.
Claim 3
Dependent Claim
23 words
The refrigerant auxiliary filter/drier unit of claim 1, wherein a cup of filter material is held in said cup shaped filter screen member.
Claim 4
Dependent Claim
19 words
The refrigerant auxiliary filter/drier unit of claim 2, wherein said cup of filter material is filled with desiccant particles.
Claim 5
Dependent Claim
45 words
The refrigerant auxiliary filter/drier unit of claim 3, wherein said cup shaped filter screen member is formed with a bottom disc shaped chamber for optimized fluid flow from the filter on out through said opening connection at the bottom of said screw top cylindrical container.
Claim 6
Dependent Claim
45 words
The refrigerant auxiliary filter/drier unit of claim 1, wherein said cup shaped filter screen member is formed with a bottom disc shaped chamber for optimized fluid flow from the filter on out through said opening connection at the bottom of said screw top cylindrical container.
Claim 7
Dependent Claim
272 words
An air conditioner refrigerant auxiliary filter/drier unit comprising: a screw top cylindrical container that may be opened and closed with a screw top that seals the container against leakage when threaded down; a fluid inlet transfer line connected to said screw top for the feeding of fluid through opening means in said screw top and extended to a screw on fitting connectable to a high pressure fitting of an air conditioning system; an opening connection at the bottom of said screw top cylindrical container; a fluid outlet transfer line connected to said opening connection and extended to a screw on fitting connectable to a low pressure fitting of an air conditioning system; and desiccant containing filter screen member placeable in said screw top cylindrical container; wherein said desiccant containing filter screen member is a cup shaped member that when placed in said screw top cylindrical container occupies substantially the internal length of said screw top cylindrical container; and "O" ring seal is positioned between the top rim of said screw top cylindrical container and the inside top surface of said screw top; a cup of filter material is held in said cup shaped filter screen member; said cup of filter material is filled with desiccant particles; said cup shaped filter screen member is formed with a bottom disc shaped chamber for optimized fluid flow from the filter on out through said opening connection at the bottom of said screw top cylindrical container; a cup of filter material is held in said cup shaped filter screen member; and an inner cup shaped screen member lines the interior of said cup of filter material.
Claim 8
Dependent Claim
272 words
An air conditioner refrigerant auxiliary filter/drier unit comprising: a screw top cylindrical container that may be opened and closed with a screw top that seals the container against leakage when threaded down; a fluid inlet transfer line connected to said screw top for the feeding of fluid through opening means in said screw top and extended to a screw on fitting connectable to a high pressure fitting of an air conditioning system; an opening connection at the bottom of said screw top cylindrical container; a fluid outlet transfer line connected to said opening connection and extended to a screw on fitting connectable to a low pressure fitting of an air conditioning system; and desiccant containing filter screen member placeable in said screw top cylindrical container; wherein said desiccant containing filter screen member is a cup shaped member that when placed in said screw top cylindrical container occupies substantially the internal length of said screw top cylindrical container; and "O" ring seal is positioned between the top rim of said screw top cylindrical container and the inside top surface of said screw top; a cup of filter material is held in said cup shaped filter screen member; said cup of filter material is filled with desiccant particles; said cup shaped filter screen member is formed with a bottom disc shaped chamber for optimized fluid flow from the filter on out through said opening connection at the bottom of said screw top cylindrical container; a cup of filter material is held in said cup shaped filter screen member; and an inner cup shaped screen member lines the interior of said cup of filter material.
Claim 9
Dependent Claim
225 words
An air conditioner refrigerant auxiliary filter/drier unit comprising: a screw top cylindrical container that may be opened and closed with a screw top that seals the container against leakage when threaded down; a fluid inlet transfer line connected to said screw top for the feeding of fluid through opening means in said screw top and extended to a screw on fitting connectable to a high pressure fitting of an air conditioning system; an opening connection at the bottom of said screw top cylindrical container; a fluid outlet transfer line connected to said opening connection and extended to a screw on fitting connectable to a low pressure fitting of an air conditioning system; and desiccant containing filter screen member placeable in said screw top cylindrical container; wherein said desiccant containing filter screen member is a cup shaped member that when placed in said screw top cylindrical container occupies substantially the internal length of said screw top cylindrical container; said cup shaped filter screen member is formed with a bottom disc shaped chamber for optimized fluid flow from the filter on out through said opening connection at the bottom of said screw top cylindrical container; and wherein a cup of filter material is held in said cup shaped filter screen member and an inner cup shaped screen member lines the interior of said cup of filter material.
Claim 10
Dependent Claim
225 words
An air conditioner refrigerant auxiliary filter/drier unit comprising: a screw top cylindrical container that may be opened and closed with a screw top that seals the container against leakage when threaded down; a fluid inlet transfer line connected to said screw top for the feeding of fluid through opening means in said screw top and extended to a screw on fitting connectable to a high pressure fitting of an air conditioning system; an opening connection at the bottom of said screw top cylindrical container; a fluid outlet transfer line connected to said opening connection and extended to a screw on fitting connectable to a low pressure fitting of an air conditioning system; and desiccant containing filter screen member placeable in said screw top cylindrical container; wherein said desiccant containing filter screen member is a cup shaped member that when placed in said screw top cylindrical container occupies substantially the internal length of said screw top cylindrical container; said cup shaped filter screen member is formed with a bottom disc shaped chamber for optimized fluid flow from the filter on out through said opening connection at the bottom of said screw top cylindrical container; and wherein a cup of filter material is held in said cup shaped filter screen member and an inner cup shaped screen member lines the interior of said cup of filter material.
Claim 11
Dependent Claim
26 words
The refrigerant auxiliary filter/drier unit of claim 7, wherein a check valve is included with said screw on fitting connected to said fluid outlet transfer line.
Claim 12
Dependent Claim
26 words
The refrigerant auxiliary filter/drier unit of claim 8, wherein a fitting adapter is provided insertable into said screw on fitting on said fluid inlet transfer line.
Claim 13
Dependent Claim
58 words
The refrigerant auxiliary filter/drier unit of claim 8, wherein said refrigerant auxiliary filter/drier unit is a portable unit connectable from a high pressure fitting to a low pressure fitting across the compressor of an air conditioning system where it filters and dries the system refrigerant where it is in the hot vapor state while the compressor is running.
Claim 14
Dependent Claim
94 words
The refrigerant auxiliary filter/drier unit of claim 8, wherein said screw top is removeable from said screw top cylindrical container and desiccant containing filter screen member is removeable as a cartridge from said screw top cylindrical container with the container then fillable with fluid additive from an additive supply container; said screw top then tightened down on said screw top cylindrical container; and then said screw on fitting is then connected to a high pressure fluid source for driving the fluid additive from said screw top cylindrical container to charge the air conditioning system.
Claim 15
Dependent Claim
19 words
The refrigerant auxiliary filter/drier unit of claim 11, wherein said high pressure fluid source is a refrigerant supply can.
Claim 16
Dependent Claim
32 words
The refrigerant auxiliary filter/drier unit of claim 11, wherein said high pressure fluid source is the high pressure fitting of an air conditioning system when the compressor of the system is running.
Claim 17
Dependent Claim
225 words
An air conditioner refrigerant auxiliary filter/drier unit comprising: a screw top cylindrical container that may be opened and closed with a screw top that seals the container against leakage when threaded down; a fluid inlet transfer line connected to said screw top for the feeding of fluid through opening means in said screw top and extended to a screw on fitting connectable to a high pressure fitting of an air conditioning system; an opening connection at the bottom of said screw top cylindrical container; a fluid outlet transfer line connected to said opening connection and extended to a screw on fitting connectable to a low pressure fitting of an air conditioning system; and a desiccant holder placeable in said screw top cylindrical container; wherein seal means is positioned between the top rim of said screw top cylindrical container and the inside top surface of said screw top; check valve means is included with said screw on fitting connected to said fluid outlet transfer line; and said cylindrical container is sized to hold a fluid charge of refrigerant additive when said desiccant holder is removed from said cylindrical container for, with said screw top tightened down and then with said screw on fitting connected to a high pressure fluid source, driving of fluid additive from said screw top cylindrical container to charge the air conditioning system.
Claim 18
Dependent Claim
225 words
An air conditioner refrigerant auxiliary filter/drier unit comprising: a screw top cylindrical container that may be opened and closed with a screw top that seals the container against leakage when threaded down; a fluid inlet transfer line connected to said screw top for the feeding of fluid through opening means in said screw top and extended to a screw on fitting connectable to a high pressure fitting of an air conditioning system; an opening connection at the bottom of said screw top cylindrical container; a fluid outlet transfer line connected to said opening connection and extended to a screw on fitting connectable to a low pressure fitting of an air conditioning system; and a desiccant holder placeable in said screw top cylindrical container; wherein seal means is positioned between the top rim of said screw top cylindrical container and the inside top surface of said screw top; check valve means is included with said screw on fitting connected to said fluid outlet transfer line; and said cylindrical container is sized to hold a fluid charge of refrigerant additive when said desiccant holder is removed from said cylindrical container for, with said screw top tightened down and then with said screw on fitting connected to a high pressure fluid source, driving of fluid additive from said screw top cylindrical container to charge the air conditioning system.
Claim 19
Dependent Claim
24 words
The refrigerant auxiliary filter/drier unit of claim 14, wherein said cylindrical container is sized to hold approximately a two ounce charge of refrigerant additive.
Claim 20
Dependent Claim
19 words
The refrigerant auxiliary filter/drier unit of claim 14, wherein said high pressure fluid source is a refrigerant supply can.
Claim 21
Dependent Claim
32 words
The refrigerant auxiliary filter/drier unit of claim 14, wherein said high pressure fluid source is the high pressure fitting of an air conditioning system when the compressor of the system is running.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |