Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7186099 | Inclined scroll machine having a special oil sump A scroll-type compressor is provided in an inclined or inverted position with an oil sump disposed adjacent to a gas inlet of the scroll wraps to allow droplets of oil to be entrained in the gas being compressed so that the oil droplets in the gas can cool the scrol... | 03/06/2007 |
| 7089760 | Air-conditioner The air-conditioner includes a compressor configured to compress and discharge a refrigerant. The air-conditioner includes a condenser configured to cool the refrigerant with air outside of a vehicle compartment. The air-conditioner includes a throttle configured to... | 08/15/2006 |
| 7036315 | Apparatus and method for detecting low charge of working fluid in a waste heat recovery system In a waste heat recovery system having a superheat controller, a reference superheat controller operating trajectory is established and compared with operational superheat controller trajectories from time to time and measuring the deviation therebetween to determin... | 05/02/2006 |
| 6952938 | Purge system and method of use A purge system operable to remove lubricant from a liquid refrigerant material removed from an evaporator of a mechanical refrigeration system. The contaminated liquid refrigerant is delivered to the purge system by gravity and the separated lubricant is returned to... | 10/11/2005 |
| 6904759 | Lubricant still and reservoir for refrigeration system A lubricant still for use in a compressor for separating oil from refrigerant, includes a vessel having an inlet for incoming oil laden refrigerant, an outlet for gaseous refrigerant, and an outlet for refrigerant laden oil. A separating structure is provided for se... | 06/14/2005 |
| 6886354 | Compressor protection from liquid hazards Two liquid levels are sensed in the oil sump of a compressor to determine if sufficient oil and excess refrigerant are present prior to starting the compressor and appropriate steps taken, if necessary. At start-up, and during operation, the presence or flow of liqu... | 05/03/2005 |
| 6834513 | Crankcase heater control A controller for controlling a heater associated with the crankcase of a compressor senses electrical current flowing through the heater. The sensing is preferably accomplished by a transformer in combination with an amplifier providing a feedback signal to the cont... | 12/28/2004 |
| 6672102 | Oil recovery and lubrication system for screw compressor refrigeration machine A vaporizer for boiling off a liquid refrigerant from a combined liquid refrigerant/lubricant mixture tapped from an evaporator utilizes hot compressed gaseous refrigerant tapped from a location upstream of the condenser. In a preferred embodiment, the re... | 01/06/2004 |
| 6658885 | Rotary compressor with muffler discharging into oil sump The entire discharge flow in a high side, vertical, hermetic rotary compressor is directed into the oil sump which generates foam for sound attenuation and heats the oil to reduce its viscosity and to drive off refrigerant dissolved in the oil.... | 12/09/2003 |
| 6553783 | Integrated U-tube and adsorbent unit An integrated U-tube and adsorbent unit including a U-tube having first and second legs and a return bend, a space between the first and second legs and the return bend, adsorbent in the space, opposite sides on the first and second legs and the return be... | 04/29/2003 |
| 6550258 | Pre-start bearing lubrication for refrigeration system compressor At or just prior to shut-down, or at least prior to a significant pressure equalization in a refrigeration system, a vessel containing pressurized oil or a pressurized oil-rich oil-refrigerant solution, possibly in combination with some refrigerant gas is... | 04/22/2003 |
| 6467300 | Refrigerated intercooler A refrigerated intercooler for an air conditioning, refrigeration or similar cooling system. The intercooler provides a thermal interface between colder refrigerant gas leaving the air conditioning system's evaporator and the hotter refrigerant liquid lea... | 10/22/2002 |
| 6449980 | Refrigeration systems A refrigeration system which comprises a compressor, an evaporator to which liquid refrigerant compressed by the compressor is supplied through a flow restrictor, and return means which direct refrigerant expanded in the evaporator back to the compressor.... | 09/17/2002 |
| 6023935 | Air conditioner An air conditioner has a refrigeration circuit formed by sequentially connecting a compressor 1, a condenser 2, an electronic expansion valve 4 and an evaporator 7 by pipes (6, 10). A compressor bypass pipe 12 is provided to connect an outlet of the evapo... | 02/15/2000 |
| 5570583 | Cooling of compressor lubricant in a refrigeration system Compressor lubricant in a screw compressor-based refrigeration system is cooled by directing the lubricant from the system oil separator to an oil-cooling heat exchanger disposed in the lower portion of the system condenser where it is bathed in condensed... | 11/05/1996 |
| 5570590 | Refrigerant reclaiming method and system An apparatus for reclaiming and purifying used refrigerant is comprised of a purification unit having a suction inlet for gaseous refrigerant and an outlet for fluid refrigerant. The suction inlet is connected through a suction accumulator in which remnan... | 11/05/1996 |
| 5469713 | Lubrication of refrigerant compressor bearings A refrigerant device comprising at least one bearing disposed in a housing having a refrigerant flow path. The bearing is contacted with a lubricant charge of a small quantity of lubricant dissolved in liquid refrigerant. At least a portion of the liquid ... | 11/28/1995 |
| 5377501 | Oil separator for conditioning recovered refrigerant A refrigerant filter/accumulator and an oil separator, both suitable for refrigerant recovery equipment, are disclosed. In the filter/accumulator (10) refrigerant enters (11), is filtered by cup-shaped filter (15), and liquid-refrigerant drains into accum... | 01/03/1995 |
| 5265432 | Oil purifying device for use with a refrigeration system An oil purification apparatus for use in conjunction with a refrigeration system. The oil purification apparatus includes an isolation tank for receiving a quantity of contaminated oil from the refrigeration system and holding the oil isolated from the re... | 11/30/1993 |
| 5252036 | Normal direction heater for compressor crankcase heat The present invention is a crankcase heater for preventing the migration of liquid refrigerant. The heater is located on the compressor housing surface near the oil sump. The heater is positioned within a fence of a terminal assembly, covering substantial... | 10/12/1993 |
| 5233842 | Accumulator for refrigeration system A heated accumulator for a refrigeration system includes a cylindrical tank closed by upper and lower tank caps. The tank is divided into upper and lower chambers by a plate disposed near the upper tank cap, with the lower chamber defining a sump. The pla... | 08/10/1993 |
| 5230222 | Compressor crankcase heater control A crankcase heater control system for a refrigeration system includes a first temperature sensor for sensing the outdoor temperature, and, a second temperature sensor for sensing compressor discharge temperature. A controller is operatively connected to t... | 07/27/1993 |
| 5195327 | Compressor drive control method for cooling and heating dual-purpose air conditioner The present invention relates to the cooling and heating dual-purpose air conditioner, and more particularly to the heat pump type cooling and heating dual-purpose air conditioner wherein the stand-by control is performed in order to prevent the viscosity... | 03/23/1993 |
| 5062277 | Combined oil heater and level sensor A thermally protected heater element is located in an oil sump such that it is normally located beneath the surface of the oil whereby the oil is heated and acts as a heat sink relative to the heater element. If the oil level drops below the heater elemen... | 11/05/1991 |
| 5040382 | Refrigerant recovery system A refrigerant recovery apparatus has features for trapping oil recovered from an air conditioning system. It has a low pressure oil separator which is mounted in line with the flow of refrigerant on the suction side of the compressor. The low pressure oil... | 08/20/1991 |
| 5012652 | Crankcase heater control for hermetic refrigerant compressors The temperature is sensed at the compressor, indoor coil and outdoors. The sensed temperatures are compared and if the compressor temperature is not a specified amount higher than the lower of the other two sensed temperatures, then the crankcase heater i... | 05/07/1991 |
| 4912938 | DC voltage bleeder for a variable speed air conditioner In a variable speed air conditioning system driven by an electronically commutated DC motor, the large DC capacitor associated with the compressor motor drive discharges to the normally AC powered compressor oil sump heater upon the loss of AC power to th... | 04/03/1990 |
| 4617808 | Oil separation system using superheat A combination superheater and oil separator for a refrigeration system having a rotary component, a source of heated medium and a source of non-superheated refrigerant gas-oil mixture includes a sealed casing, a heat transfer unit within the casing having... | 10/21/1986 |
| 4249389 | Crankcase oil return for a transport refrigeration system providing both heating and cooling This invention provides a direct oil return system from the accumulator tank in the refrigerant circuit of a transport refrigeration system to the crankcase of the compressor for returning oil entrained in the refrigerant to the oil sump. A pressure relie... | 02/10/1981 |
| 4236379 | Heat pump compressor crankcase low differential temperature detection and control system A compressor crankcase low differential temperature detection and control system for a reverse-cycle refrigeration system for detecting an abnormally low temperature crankcase and for controlling the system in response to such fault detection by inhibitin... | 12/02/1980 |
| 4208883 | Compressors for heat pumps A compressor for a heat pump using a condensible gas as a working fluid has a lubricant temperature controller comprising a heater for the lubricant in the sump, the heater being controlled by differential pressure responsive means comprising the vapor pr... | 06/24/1980 |
| 4066869 | Compressor lubricating oil heater control A control for selectively energizing a heater provided to raise the temperature of lubricating oil of a compressor employed in a refrigeration unit. The control includes a thermostatically operated switch provided to sense a temperature indicative of lubr... | 01/03/1978 |
| 4004431 | Control for cooling unit A cooling unit for a building area or the like and a compressor control for the cooling unit, the latter including a compressor for compressing gaseous refrigerant and having temperature sensing means mounted on the compressor housing and coacting with he... | 01/25/1977 |
