US4866994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system oil measurement and sampling device
Assignee: Motors Liquidation Co
•
Filing: 1988-07-18
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Granted: 1989-09-19
•
Expires: 2008-07-18
Abstract
Abstract A sample cell connected through valving to a refrigeration system allows a prescribed mass of refrigerant with entrained oil to be collected and the refrigerant to be vaporized and returned to the system while leaving the oil in a graduated measuring tube. The sample cell has transparent upper and lower portions with graduated bores for measurement of the original sample and the oil residue, and an aluminum middle portion also containing a bore for conducting heat from the ambient air to the refrigerant to assist in the vaporization as well as for normalizing the temperature of the sample during filling.
Inventors
- 👤 James A. Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:43
CPC Classifications
F; F25; F25B; F25B45/00; G; G01; G01F; G01F23/00; G01F23/02; G01N; G01N1/00; G01N1/02; G01N1/10; G01N1/28; G01N1/40; G01N1/4022; G01N2001/4033
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
A sampling device for use with a refrigeration system having a refrigerant and oil entrained therein, comprising; an elongated reservoir having a stepped bore therein for receiving refrigerant and oil carried thereby, the reservoir comprising a large bore diameter upper section having an index marking the fill level of the reservoir and a small bore diameter lower section having graduation marks for oil level measurement, the upper and lower sections comprising transparent material to allow observation of the contents, first valve means for coupling the reservoir to the refrigeration system to admit liquid refrigerant to the reservoir, second valve means for selectively coupling the reservoir to the low pressure side of the refrigeration system or to a vacuum line to evacuate vaporized refrigerant from the reservoir, and means for supplying heat to the refrigerant in the bore to facilitate vaporization of the refrigerant.
Claim 2
Dependent Claim
143 words
A sampling device for use with a refrigeration system having a refrigerant and oil entrained therein, comprising; an elongated reservoir having a stepped bore therein for receiving refrigerant and oil carried thereby, the reservoir comprising a large bore diameter upper section having an index marking the fill level of the reservoir and a small bore diameter lower section having graduation marks for oil level measurement, the upper and lower sections comprising transparent material to allow observation of the contents, first valve means for coupling the reservoir to the refrigeration system to admit liquid refrigerant to the reservoir, second valve means for selectively coupling the reservoir to the low pressure side of the refrigeration system or to a vacuum line to evacuate vaporized refrigerant from the reservoir, and means for supplying heat to the refrigerant in the bore to facilitate vaporization of the refrigerant.
Claim 3
Dependent Claim
47 words
The invention as defined in claim 1 wherein the means for supplying heat to the refrigerant comprises a middle section of the reservoir between the upper section and the lower section, the middle section comprising heat conducting material to conduct heat from ambient air to the refrigerant.
References Cited (Backward Citations)
US389494A
Cited
US1525007A
Cited
US1637920A
Cited
US2577598A
Cited
US3050449A
Cited
US3153913A
Cited
US3544276A
Cited
US3487692A
Cited
US3638476A
Cited
SU368487A1
Cited
US3985624A
Cited
US4404845A
Cited
US4610169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |