US3715539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid level monitoring system
Assignee: HARNESSED EN Inc
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Filing: 1970-12-10
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Granted: 1973-02-06
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Expires: 1990-12-10
Abstract
Abstract A fluid monitoring system wherein a float having a permanent magnet is disposed in a chamber containing fluid therein. The magnet is disposed on the bottom of the float. A hollow tube passes through the lower portion of the chamber and is sealed in a fluid-tight manner at either end thereof. A magnetic reed switch is disposed in the tube and is connected to a circuit which provides a visual indication when the reed switch is actuated. If the level of the fluid in the chamber decreases to a predetermined level, the float level decreases solely as a function of the fluid level in the chamber. The magnetic field created by the permanent magnet when adjacent the reed switch disposed in the tube in the chamber will actuate the switch which provides a visual indication that the predetermined lower level has been reached. If the level of fluid in the chamber increases, the float moves upwardly as the liquid level increases, the magnet moves away from the reed switch, and the indicator would be deactivated.
Inventors
- 👤 P Silberg
- 👤 J Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:28
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/30; G01F23/64; G01F23/68; G01F23/70; H; H01; H01H; H01H36/00; H01H36/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
In a fluid level indicator for monitoring the fluid level in a radiator or similar vessel wherein a housing is secured to the radiator, the housing having inlet and outlet conduits and a float chamber, the conduits providing fluid flow communication between the chamber and the radiator, a float disposed in the chamber and having a magnet secured thereto, a switch disposed within the housing and adapted to be actuated by the magnet, the improvement which comprises: means to prevent the rotative movement of the float in the float chamber regardless of the position of the float in the chamber.
Claim 2
Dependent Claim
100 words
In a fluid level indicator for monitoring the fluid level in a radiator or similar vessel wherein a housing is secured to the radiator, the housing having inlet and outlet conduits and a float chamber, the conduits providing fluid flow communication between the chamber and the radiator, a float disposed in the chamber and having a magnet secured thereto, a switch disposed within the housing and adapted to be actuated by the magnet, the improvement which comprises: means to prevent the rotative movement of the float in the float chamber regardless of the position of the float in the chamber.
Claim 3
Dependent Claim
100 words
In a fluid level indicator for monitoring the fluid level in a radiator or similar vessel wherein a housing is secured to the radiator, the housing having inlet and outlet conduits and a float chamber, the conduits providing fluid flow communication between the chamber and the radiator, a float disposed in the chamber and having a magnet secured thereto, a switch disposed within the housing and adapted to be actuated by the magnet, the improvement which comprises: means to prevent the rotative movement of the float in the float chamber regardless of the position of the float in the chamber.
Claim 4
Dependent Claim
100 words
In a fluid level indicator for monitoring the fluid level in a radiator or similar vessel wherein a housing is secured to the radiator, the housing having inlet and outlet conduits and a float chamber, the conduits providing fluid flow communication between the chamber and the radiator, a float disposed in the chamber and having a magnet secured thereto, a switch disposed within the housing and adapted to be actuated by the magnet, the improvement which comprises: means to prevent the rotative movement of the float in the float chamber regardless of the position of the float in the chamber.
Claim 5
Dependent Claim
55 words
The indicator of claim 1 where the magnet is an elongated magnet disposed on the bottom of the float, the switch disposed within the housing is a reed switch, and the means to prevent the rotative movement of the float ensures that the magnet remains orientated substantially parallel to and centered over the reed switch.
Claim 6
Dependent Claim
51 words
The indicator of claim 1 wherein the means to prevent the rotative movement of the float includes first guide means disposed on the float and second guide means disposed within the housing, the first and second guide means adapted to form a mating assembly to prevent rotative movement of the float.
Claim 7
Dependent Claim
63 words
The indicator of claim 1 wherein the first guide means includes a float guide disposed on the bottom of the float, the guide having tines extending downwardly; the second guide means includes a cross clip having extending horizontal arms, said clip secured to the switch, the arms of the cross clip received in the opening defined by the tines of the float guide.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |