Blended refrigeration oil composition
Abstract
Abstract A WIDE BOILING RANGE (E.G FOR A GIVEN VGC) REFRIGERATION OIL, HAVING GOOD CHEMICAL AND THERMAL STABILITY AND GOOD MISCIBILITY WITH FLUORINATED HYDROCARBON REFRIGERAANTS, COMPRISES A BLEND OF FROM 50-75 VOLUME PERCENT OF A HYDROREFINED NAPHTHENIC OIL COMPONENT AND 50-25 VOLUME PERCENT OF A WAX FREE PARAFFINIC COMPONENT (SUCH AS A SOLVENT REFINED AND DEWAXED PARAFFINIC OIL). PREFERABLY THE HYDROREFINED NAPHTHENIC OIL COMPONENT (WHICH CAN BE A BLEND OF TWO OR MORE HYDROREFINED OILS) HAS AN SUS VISCOSITY AT 100*F. IN THE RANGE OF 75-750 SUS AND THE PARAFFINIC COMPONENT (WHICH CAN BE A BLEND) IS CHOSEN SO THAT THE RESULTING NAPHTHENIC-PARAFFINIC BLEND HAS A VISCOSITY AT 100*F. IN THE RANGE OF 100-500 SUS (PREFERABKY 125-300 SUS, TYPICALLY 150-250 SUS) AND HAS A MAXIMUM NAUTRAL FLOC POINT OF -35*F. PREFERABLY THE BLEND CONTAINS LESS THAN 10 P.P.M. (MORE PREFERABLY LESS THAN 5) OF BASIC NITROGEN AND CONTAINS IN THE RANGE OF 15-35 WEIGHT PERCENT AROMATICS. THE PREFERRED PARAFFINIC COMPONENTS INCLUDE DEWAXED PARAFFINIC PETROLEUM LUBES WAX-FREE HYDROGENATED POLYOLEFINS OILS, HYDROCRACKED LUBES AND MIXTURES THEREOF.
Inventors
- 👤 I Mills
- 👤 J Melchiore
Bibliographic Details
Claims Analysis
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |