Patent US4080593A successfully refreshed from Google Patents.
US4080593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the detection of liquid components in gases for dry-running compressors
Assignee: Atlas Copco AB
•
Filing: 1976-10-08
•
Granted: 1978-03-21
•
Expires: 1996-10-08
Abstract
Abstract A device for the detection of liquid components in gases, especially to detect the presence of liquids such as lubricants in gases subjected to compression in dry-running compressors, comprises an electric capacitor having a moisture-receptive dielectric with dielectric constant varying from a normal dielectric constant in the presence of the absorbed liquid. The capacitor is connected in a capacitance-detection circuit and can operate an alarm or the like.
Inventors
- 👤 Helmut Gernandt
- 👤 Heinz Heeg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:12
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/223; G01N27/225; G01N27/226
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A dry-running compressor comprising: a housing forming a gas space; a linearly reciprocatable piston rod extending through said gas space; a dry-running bushing on said housing surrounding said piston rod at one side of said space; an oil stripping ring bushing surrounding said piston rod and received in said housing on an opposite side of said space; and respective oil detectors in said space adjacent each of said bushings for automatically indicating the incursion of oil into said base, each of said detectors comprising: a copper plate lying against the respective bushing; a layer of blotting paper disposed on the respective copper plate; a copper fabric disposed on the respective layer of blotting paper, said detectors each being annular and surrounding said piston rod; and respective circuit means connected across the plate and fabric of each detector and responsive to a change in capacitance thereof.
Claim 2
Dependent Claim
145 words
A dry-running compressor comprising: a housing forming a gas space; a linearly reciprocatable piston rod extending through said gas space; a dry-running bushing on said housing surrounding said piston rod at one side of said space; an oil stripping ring bushing surrounding said piston rod and received in said housing on an opposite side of said space; and respective oil detectors in said space adjacent each of said bushings for automatically indicating the incursion of oil into said base, each of said detectors comprising: a copper plate lying against the respective bushing; a layer of blotting paper disposed on the respective copper plate; a copper fabric disposed on the respective layer of blotting paper, said detectors each being annular and surrounding said piston rod; and respective circuit means connected across the plate and fabric of each detector and responsive to a change in capacitance thereof.
Claim 3
Dependent Claim
28 words
The dry-running compressor defined in claim 1 wherein said circuit means includes alarm means triggered upon a change in the capacitance of the respective layer of blotting paper.
Claim 4
Dependent Claim
15 words
The dry-running compressor defined in claim 2 wherein said circuit means includes a visual alarm.
Claim 5
Dependent Claim
14 words
The dry-running compressor defined in claim 2 wherein said alarm is an acoustic alarm.
Claim 6
Dependent Claim
31 words
The dry-running compressor defined in claim 2 wherein circuit means includes switch means whereby said compressor is turned off by a change in dielectric constant of said layer of blotting paper.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |