Patent US3786464A successfully refreshed from Google Patents.
US3786464A
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US
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Maximum level detector
Assignee: Individual
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Filing: 1971-06-11
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Granted: 1974-01-15
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Expires: 1991-06-11
Abstract
Abstract This device for detecting the maximum predetermined level of a liquid in a vessel, for example a bath tub, and warning the user when this level is attained, comprises essentially two elements, i.e., a bottom or reference element retained by gravity at the bottom of the vessel, and a float element remaining by buoyancy at the level of the liquid, and means interconnecting these two elements. These means are either telescopic or flexible, for example in the form of a nylon cord, and the float encloses a circuit comprising a source of current, a switch and a sound and/or luminous signal device. The switch is closed when the float attains the maximum preset level.
Inventors
- 👤 J Staempfli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:17
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/30; G01F23/56; G01F23/60; G01F23/40; G01F23/44; G01F23/64; G01F23/68; G01F23/70
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
An alarm device for detecting the level of a varying level of liquid in a vessel comprising, a reference means immersible in liquid positioned in use in a vessel for determining a reference datum relative to which a predetermined level of a varying level of liquid increasing in volume in the vessel is to be detected and its attainment indicated, a float means for floating freely on the surface of the liquid in operation as the liquid level changes, means connecting said reference means and said float means to establish said predetermined level of the liquid as a function of a preselected distance between said reference means and said float means, an alarm means in said float means coupled to and actuated by said connecting means for sensing when the relative distance between said reference means and said float means corresponds to said preselected distance and thereby is representative of the attainment of said predetermined level and means responsive to the last-mentioned means for energizing said alarm means to indicate the attainment of said predetermined liquid level.
Claim 2
Dependent Claim
177 words
An alarm device for detecting the level of a varying level of liquid in a vessel comprising, a reference means immersible in liquid positioned in use in a vessel for determining a reference datum relative to which a predetermined level of a varying level of liquid increasing in volume in the vessel is to be detected and its attainment indicated, a float means for floating freely on the surface of the liquid in operation as the liquid level changes, means connecting said reference means and said float means to establish said predetermined level of the liquid as a function of a preselected distance between said reference means and said float means, an alarm means in said float means coupled to and actuated by said connecting means for sensing when the relative distance between said reference means and said float means corresponds to said preselected distance and thereby is representative of the attainment of said predetermined level and means responsive to the last-mentioned means for energizing said alarm means to indicate the attainment of said predetermined liquid level.
Claim 3
Dependent Claim
38 words
An alarm device for detecting the level of a varying level of liquid in a vessel according to claim 1, in which said means connecting said reference means and said float means comprises means defining variable telescopic means.
Claim 4
Dependent Claim
49 words
An alarm device for detecting the level of a varying level of liquid in a vessel according to claim 1, in which said means connecting said reference means and float means comprises variable means for setting individually different predetermined selected levels of said liquid to be detected and indicated.
References Cited (Backward Citations)
US892425A
Cited
US3545272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |