US Patent No: 6,505,475
Number of patents in Portfolio can not be more than 2000
Method and apparatus for measuring and improving efficiency in refrigeration systems
Stats
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Jan 14, 2003
Issued date -
May 23, 2000
filing date -
09/577,703
serial no -
In Force
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Abstract
An apparatus for optimizing an efficiency of a refrigeration system comprising means for measuring a refrigeration efficiency of an operating refrigeration system: means for altering a process variable of the refrigeration system during efficiency measurement: and a process for calculating a process variable level which achieves an optimum efficiency. The process variables may include refrigerant charge and refrigerant oil concentration in evaporator.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,611,211 Refirgeration system with electrically controlled refrigerant storage device | 11 | 1994 | |
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| 4,420,947 Heat pump air conditioning system | 39 | 1982 | |
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| 4,484,452 Heat pump refrigerant charge control system | 23 | 1983 | |
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| 4,365,482 Device at heating or cooling unit | 7 | 1980 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jul 14, 2014 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |