US3587079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mist sensor
Assignee: Lubriquip Inc
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Filing: 1968-09-04
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Granted: 1971-06-22
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Expires: 1988-09-04
Abstract
Abstract A mist sensor for sensing mist such as oil mist used for lubricating purposes so as to give a warning if the oil mist falls below a predetermined density so that the machine being lubricated may be stopped before being damaged. A test circuit and indicator is provided for assuring that the warning light is operative so that the indicator will not fail to operate due to a faulty indicator circuit.
Inventors
- 👤 Ronald F Obergefell
- 👤 Robert R Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:16
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/534
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
208 words
Apparatus for detecting the density of a fluid comprising: a chamber through which said fluid passes, a light source having a filament for supplying light in said chamber, a light detector mounted to receive light from said light source, a power supply, a first relay, a silicon controlled rectifier connected in series with said first relay across said power supply, the light detector connected to one side of the power supply and to the gate of the silicon controlled rectifier, a second relay connected in parallel with the filament of said light source and energized when said filament is open, three indicators, a first pair of switches in series with a first of said indicators across said poWer supply, a third switch connected in series with a second of said indicators across said power supply, a fourth switch connected in series with a third of said indicators across said power supply, said first relay connected to control the first one of said pair of switches and the third switch such that when one is open the other is closed, and said second relay connected to control the second one of said pair of switches and the fourth switch such that when one is open the other is closed.
Claim 2
Dependent Claim
208 words
Apparatus for detecting the density of a fluid comprising: a chamber through which said fluid passes, a light source having a filament for supplying light in said chamber, a light detector mounted to receive light from said light source, a power supply, a first relay, a silicon controlled rectifier connected in series with said first relay across said power supply, the light detector connected to one side of the power supply and to the gate of the silicon controlled rectifier, a second relay connected in parallel with the filament of said light source and energized when said filament is open, three indicators, a first pair of switches in series with a first of said indicators across said poWer supply, a third switch connected in series with a second of said indicators across said power supply, a fourth switch connected in series with a third of said indicators across said power supply, said first relay connected to control the first one of said pair of switches and the third switch such that when one is open the other is closed, and said second relay connected to control the second one of said pair of switches and the fourth switch such that when one is open the other is closed.
Claim 3
Dependent Claim
28 words
Apparatus according to claim 1 comprising a potentiometer connected in circuit with the light detector and the gate to adjust the gating level of the silicon controlled rectifier.
Claim 4
Dependent Claim
15 words
Apparatus according to claim 1 comprising a second impedance in circuit with said second relay.
Claim 5
Dependent Claim
100 words
Apparatus for detecting the density of a fluid according to claim 1 wherein said first pair of switches are closed when the density of fluid in the chamber is sufficient and the first indicator is activated, wherein said third switch is closed and the first one of said pair of switches is open and the second indicator is activated when the density of fluid in said chamber is below a desired level, and wherein said fourth switch is closed and the second of said pair of switches is open and the third indicator is activated when the filament is open.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |