US4934149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing chlorofluorocarbon refrigerant emissons to the atmosphere
Assignee: Lockheed Martin Energy Systems Inc
•
Filing: 1989-01-06
•
Granted: 1990-06-19
•
Expires: 2009-01-06
Abstract
Abstract A method is disclosed for reducing chloroflurocarbon (CFC) refrigerant emissions during removal or transfer or refrigerants from a vapor compression cooling system or heat pump which comprises contacting the refrigerant with a suitable sorbent material. The sorbent material allows for the storage and retention or the chlorofluorocarbon in non-gaseous form so that it does not tend to escape to the atmosphere where it would cause harm by contributing to ozone depletion. In other aspects of the invention, contacting of CFC refrigerants with sorbent material allows for purification and recycling of used refrigerant, and a device containing stored sorbent material can be employed in the detection of refrigerant leakage in a cooling system or heat pump.
Inventors
- 👤 Robert C. DeVault
- 👤 Phillip D. Fairchild
- 👤 Wendell J. Biermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:46
CPC Classifications
F; F25; F25B; F25B45/00; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1487; B01D53/1493; B01D53/34; B01D53/46; B01D53/68; B01D53/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A method of reducing escape of chlorofluorocarbon refrigerant emissions to the atmosphere during removal of a chlorofluorocarbon refrigerant from a vapor compression cooling system or heat pump comprising contacting the chlorofluorocarbon refrigerant during removal with a sorbent material into which the chlorofluorocarbon refrigerant can be dissolved, said sorbent material being selected from the group consisting of N-methyl-2-pyrrolidone, ethyl tetrahydro furfuryl ether, tetramethylene glycol dimethylether, triethylene glycol dimethylether, N,N-diemethyl formamide, dimethylamides, and tetrachloroethane.
Claim 2
Independent Claim
72 words
A method of reducing escape of chlorofluorocarbon refrigerant emissions to the atmosphere during removal of a chlorofluorocarbon refrigerant from a vapor compression cooling system or heat pump comprising contacting the chlorofluorocarbon refrigerant during removal with a sorbent material into which the chlorofluorocarbon refrigerant can be dissolved, said sorbent material being selected from the group consisting of N-methyl-2-pyrrolidone, ethyl tetrahydro furfuryl ether, tetramethylene glycol dimethylether, triethylene glycol dimethylether, N,N-diemethyl formamide, dimethylamides, and tetrachloroethane.
Claim 3
Dependent Claim
12 words
A method according to claim 1 wherein the sorbent material comprises 1,1,2,2-tetrachloroethane.
Claim 4
Independent Claim
68 words
A method of detecting a condition of low refrigerant charge in a vapor compression cooling system or heat pump comprising placing a sorbent material-containing storage device into the cooling system or heat pump so that the refrigerant of the system or pump will flow through the storage device, and monitoring the temperature of the storage device in order to determine if a condition of low refrigerant charge exists.
Claim 5
Independent Claim
68 words
A method of detecting a condition of low refrigerant charge in a vapor compression cooling system or heat pump comprising placing a sorbent material-containing storage device into the cooling system or heat pump so that the refrigerant of the system or pump will flow through the storage device, and monitoring the temperature of the storage device in order to determine if a condition of low refrigerant charge exists.
Claim 6
Dependent Claim
49 words
A method according to claim 3 wherein the temperature is monitored at a second point in the cooling system or heat pump, and a condition of lower refrigerant charge is determined by a comparison of the temperature at the storage device with the temperature at the second point monitored.
Claim 7
Dependent Claim
48 words
A method according to claim 4 wherein temperature is monitored at the storage device and at the compressor of a cooling system or heat pump, and a condition of lower refrigerant charge is determined by comparing the temperature at the storage device with the temperature at the compressor.
References Cited (Backward Citations)
US3967465A
Cited
US4017252A
Cited
US3950960A
Cited
US3972201A
Cited
US4259846A
Cited
US4363222A
Cited
US4580404A
Cited
US4761961A
Cited
US4768347A
Cited
US4776174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |