Radio Systems Corporation

Brenda Cole

E Douglas Grindstaff

Julianne Sudman

A pet door having a locking mechanism for normally limiting ingress and egress, the pet door being adapted communicate with a conventional environmental detector to unlock the locking mechanism when a hazard environmental condition is detected. The pet door is adapted to work in cooperation with either a conventional smoke detector or an improved smoke detector. In one embodiment, a radio frequency (RF) transmitter is used in cooperation with a conventional smoke detector to communicate with a pet door of the present invention. In either embodiment, when the smoke detector detects an event such as the presence of smoke and/or fire such that an audible alarm is sounded, the pet door locking mechanism is unlocked. The pet door is also useful in cooperation with other detectors such as a carbon monoxide detector or a security alarm.

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Reisterstown, MD, United States of America

Brenda Cole