US4801922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature alarm
Assignee: Individual
•
Filing: 1987-05-14
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Granted: 1989-01-31
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Expires: 2007-05-14
Abstract
Abstract An alarm device has a housing provided with visual and audio alarm indicators which give a warning when the temperature of a particular location is at a predetermined relatively low temperature to prevent freezing and wherein a modification is provided which has a switch that activates an enhanced audio alarm responsive to a predetermined temperature lower than the first referred to temperature.
Inventors
- 👤 Darhl R. Worrell
- 👤 George Spector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:40
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/18; G08B21/182
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
289 words
A temperature alert device which comprises: (a) a housing fabricated out of non-conductive material; (b) a battery within said housing to introduce a source of electric current; (c) a visual alarm indicator within said housing electrically connected in series to said battery; (d) an audio alarm indicator within said housing electrically connected in series to said battery; (e) a test switch within said housing electrically connected between said battery and said indicators so when said test switch is manually closed, said visual alarm indicator and said audio alarm indicator will operate, thus proving said battery is functioning; (f) a thermostatic switch within said housing electrically connected between said battery and said indicators so as to activate said visual alarm indicator and said audio alarm indicator when the temperature drops to a predetermined level as set in thermostatic switch; and (g) an on-off switch within said housing electrically connected between said battery and said thermostatic switch so as to be manually operated to turn the source of electric current on and off, wherein said visual alarm indicator is an electric light bulb, said audio alarm indicator is a horn, and said thermostatic switch includes a bimetallic disc fastened at one end to said housing adapted to engage a contact provided adjacent an intermediate point spaced from said one end, wherein (h) said thermostatic switch includes a second contact at a distal end of said disc spaced from the first said contact and further including (i) an amplifier within said housing electrically connected between said second contact in said thermostatic switch and said horn whereby when temperature drops to a lower predetermined level as set in said thermostatic switch, said amplifier will be activated to increase the volume of said horn.
Claim 2
Dependent Claim
289 words
A temperature alert device which comprises: (a) a housing fabricated out of non-conductive material; (b) a battery within said housing to introduce a source of electric current; (c) a visual alarm indicator within said housing electrically connected in series to said battery; (d) an audio alarm indicator within said housing electrically connected in series to said battery; (e) a test switch within said housing electrically connected between said battery and said indicators so when said test switch is manually closed, said visual alarm indicator and said audio alarm indicator will operate, thus proving said battery is functioning; (f) a thermostatic switch within said housing electrically connected between said battery and said indicators so as to activate said visual alarm indicator and said audio alarm indicator when the temperature drops to a predetermined level as set in thermostatic switch; and (g) an on-off switch within said housing electrically connected between said battery and said thermostatic switch so as to be manually operated to turn the source of electric current on and off, wherein said visual alarm indicator is an electric light bulb, said audio alarm indicator is a horn, and said thermostatic switch includes a bimetallic disc fastened at one end to said housing adapted to engage a contact provided adjacent an intermediate point spaced from said one end, wherein (h) said thermostatic switch includes a second contact at a distal end of said disc spaced from the first said contact and further including (i) an amplifier within said housing electrically connected between said second contact in said thermostatic switch and said horn whereby when temperature drops to a lower predetermined level as set in said thermostatic switch, said amplifier will be activated to increase the volume of said horn.
Claim 3
Dependent Claim
45 words
A temperature alert device as recited in claim 1, further comprising an adjustment screw fabricated out of non-conductive material and threaded through said housing to make contact with said bimetallic disc to control the temperature at which said thermostatic switch will be caused to operate.
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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |