US4169357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerator and freezer monitoring device
Assignee: Individual
•
Filing: 1978-05-01
•
Granted: 1979-10-02
•
Expires: 1998-05-01
Abstract
Abstract A temperature-sensitive switch in a refrigerator or freezer, separate from the refrigeration and freezer equipment, remains open when the temperature is below a predetermined level and closes when the temperature rises above the predetermined level. A visible alarm and an audible alarm are provided outside the refrigerator and freezer at a commercial power source wall-type outlet. A battery is electrically connected to the visible and audible alarms via the temperature-sensitive switch whereby when the temperature in the refrigerator or freezer rises above the predetermined level, the alarms are actuated.
Inventors
- 👤 Joseph B. Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:04
CPC Classifications
F; F25; F25D; F25D29/00; F25D29/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
216 words
A refrigerator and freezer monitoring device for indicating when electrical energy is supplied thereto and for warning when the temperature rises above a predetermined level, said refrigerator and freezer being powered by a commercial power source via a wall-type outlet, said refrigerator and freezer monitoring device comprising a temperature-sensitive switch in a refrigerator and freezer, separate from the refrigeration and freezer equipment said switch remaining open when the temperature is below a predetermined level and closing when the temperature rises above said predetermined level; visible alarm means outside and separate from the refrigerator and freezer at the wall-type outlet; audible alarm means outside and separate from the refrigerator and freezer at the wall-type outlet; battery means electrically connected to the visible alarm means and the audible alarm means via the temperature-sensitive switch whereby when the temperature in the refrigerator and freezer rises above the predetermined level the visible and audible alarm means are actuated; a power switch remaining closed when the commercial power source provides the required power and which opens when the commercial power source fails; and a power indicating lamp at the wall-type outlet and electrically connected to the commercial power source via the power switch whereby said power lamp is energized as long as sufficient power is provided by the commercial power source.
Claim 2
Dependent Claim
216 words
A refrigerator and freezer monitoring device for indicating when electrical energy is supplied thereto and for warning when the temperature rises above a predetermined level, said refrigerator and freezer being powered by a commercial power source via a wall-type outlet, said refrigerator and freezer monitoring device comprising a temperature-sensitive switch in a refrigerator and freezer, separate from the refrigeration and freezer equipment said switch remaining open when the temperature is below a predetermined level and closing when the temperature rises above said predetermined level; visible alarm means outside and separate from the refrigerator and freezer at the wall-type outlet; audible alarm means outside and separate from the refrigerator and freezer at the wall-type outlet; battery means electrically connected to the visible alarm means and the audible alarm means via the temperature-sensitive switch whereby when the temperature in the refrigerator and freezer rises above the predetermined level the visible and audible alarm means are actuated; a power switch remaining closed when the commercial power source provides the required power and which opens when the commercial power source fails; and a power indicating lamp at the wall-type outlet and electrically connected to the commercial power source via the power switch whereby said power lamp is energized as long as sufficient power is provided by the commercial power source.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |