Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
In an alarm system for emergency vehicles, a plurality of transmitter sections, each said transmitter section comprising: an antenna; a transmitter connected to excite said antenna; signal generating encoder means for modulating said transmitter, said encoder means having a different duty cycle than, and being adapted to operate in non-synchronism with respect to the signal generating encoder means of any other transmitter section in said system.
Claim 2
Dependent Claim
66 words
In an alarm system for emergency vehicles, a plurality of transmitter sections, each said transmitter section comprising: an antenna; a transmitter connected to excite said antenna; signal generating encoder means for modulating said transmitter, said encoder means having a different duty cycle than, and being adapted to operate in non-synchronism with respect to the signal generating encoder means of any other transmitter section in said system.
Claim 3
Dependent Claim
13 words
The system of claim 1 wherein said encoders operate at different duty cycles.
Claim 4
Dependent Claim
20 words
The system of claim 1 and an indicator responsive to said encoder to indicate excitation of said transmitter and antenna.
Claim 5
Dependent Claim
20 words
The system of claim 1 and a receiver section responsive to the signals from the transmitter seCtions of other vehicles.
Claim 6
Dependent Claim
15 words
The system of claim 4 and an indicator responsive to excitation of said receiver section.
Claim 7
Dependent Claim
20 words
The system of claim 4 and means to cut off response to said receiver section during operation of said encoder.
Claim 8
Dependent Claim
23 words
The system of claim 4 and a multiplexer operative to provide selective operation of said antenna by said transmitter and said receiver section.
Claim 9
Dependent Claim
14 words
The system of claim 5 wherein said indicator operates both visual and aural outputs.
Claim 10
Dependent Claim
22 words
The system of claim 5 and second means also responsive to excitation of said receiver section to indicate outside of the vehicle.
Claim 11
Dependent Claim
135 words
An alarm system for a substantially enclosed area such as a vehicle, capable of indicating the presence of an emergency, adapted for use in a fleet comprising both emergency and receiving vehicles, said system comprising: in the receiving vehicle, an antenna, a receiver, a decoder and an indicator; and in each emergency vehicle, an antenna, a transmitter, a signal generating encoder means for modulating said transmitter, said encoder means having a different duty cycle than, and being adapted to operate in non-synchronism with respect to, the signal generating encoder means of any other transmitter section in any other emergency vehicle, a receiver, a decoder, means to inhibit operation of said emergency vehicle receiver when said emergency vehicle encoder is operated and means to multiplex said emergency vehicle antenna between said emergency vehicle transmitter and receiver.
Claim 12
Dependent Claim
135 words
An alarm system for a substantially enclosed area such as a vehicle, capable of indicating the presence of an emergency, adapted for use in a fleet comprising both emergency and receiving vehicles, said system comprising: in the receiving vehicle, an antenna, a receiver, a decoder and an indicator; and in each emergency vehicle, an antenna, a transmitter, a signal generating encoder means for modulating said transmitter, said encoder means having a different duty cycle than, and being adapted to operate in non-synchronism with respect to, the signal generating encoder means of any other transmitter section in any other emergency vehicle, a receiver, a decoder, means to inhibit operation of said emergency vehicle receiver when said emergency vehicle encoder is operated and means to multiplex said emergency vehicle antenna between said emergency vehicle transmitter and receiver.