Refrigeration monitor system with remote signalling of alarm indications

Patent 4482785 Issued on November 13, 1984. Estimated Expiration Date:

September 23, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3441929

3544722

3772668

3899645

3925622

Traffic control system
Patent #: 4025922
Issued on: 05/24/1977
Inventor: Trawick, III

Refrigeration unit air temperature detection alarm system
Patent #: 4028688
Issued on: 06/07/1977
Inventor: Goleman

Telephone alarm system
Patent #: 4051327
Issued on: 09/27/1977
Inventor: Rigsby

Closed-loop emergency alarm and response system
Patent #: 4064368
Issued on: 12/20/1977
Inventor: Dibner

Freezer alarm with extended life
Patent #: 4146886
Issued on: 03/27/1979
Inventor: Timblin

More ...

Inventors

Application

No. 06/421982 filed on 09/23/1982

US Classes:

379/22.03, Fault detection or fault location on telephone link (e.g., continuity, leakage)340/539.1, Radio340/539.26, Specific environmental sensor340/585, Refrigerated storage379/40, Automatic dialing379/41Transmission of recorded audio message

Examiners

Primary: George, Keith E.

Attorney, Agent or Firm

Oltman and Flynn

International Classes

H04M 11/04 (20060101)
F25D 29/00 (20060101)

Abstract

A refrigeration monitor system for monitoring an unattended freezer installation having a number of freezer compartments containing perishable products. The system comprises a network of temperature sensors located in the freezer compartments and connected to a common control which is connected to one or more telephone lines. The common control is capable of dialling in sequence anyone of a group of selected alarm numbers. The person answering the alarm call receives a recorded message and must return a preselected answer code that is received by the system, and which stops the system from sending more alarm calls. The system continues to dial alarm numbers until it receives a satisfactory answer code. As a further safety measure the system, upon initiating an alarm, sets an alarm status indicator that must be manually reset within a preset time by the person attending to the freezer installation in response to the alarm, or else a new alarm sequence is automatically initiated. The system also provides means for remotely testing the system by dialling the system from one of the alarm numbers.