Radio telephone

Claim 2

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slidable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to perform respective predetermined functions responsive to respective sequences of actuations of the keys, the processor being operable to perform the predetermined functions corresponding to the respective sequences of actuations of exposed ones of the keys, which are concealable by the extending portion, for a range of positions of the extending portion, wherein the plurality of keys include a first group of alphanumeric keys and a second group of control keys, and wherein the processor is operable to perform the predetermined function corresponding to at least one of the control keys for all positions of the extending portion including when the at least one control key is concealed by the extending portion, wherein the processor is operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 3

A radio handset according to claim 1 further comprising an additional key exposed when the extending portion is in the first position.

Claim 4

A radio handset according to claim 2 wherein the additional key is operable to control the volume of the output of the radio handset.

Claim 5

A radio handset according to claim 1 wherein if an incoming call is indicated, actuation of an exposed key places the handset in the off-hook condition.

Claim 6

A radio handset according to claim 1 wherein the processor means is operable to perform the predetermined functions corresponding to sequences of actuations of the exposed ones of the keys for each position of the extending portion.

Claim 7

A radio handset according to claim 1 wherein the range of positions comprises the extending portion occupying any position intermediate the first and second positions.

Claim 8

A radio handset according to claim 1 wherein the main body comprises a first transducer and the extending portion comprises a second transducer, the first and second transducers being operational when the extending portion is in the first and second positions and positions intermediate the first and second positions.

Claim 9

A radio handset according to claim 1 wherein movement of the extending portion from the first position causes a call to be answered.

Claim 10

A radio handset according to claim 1 wherein movement of the extending portion to the first position causes a call to be terminated.

Claim 11

A radio handset according to claim 1 further comprising a switch connected to the processor for signaling when the extending portion is moved on the main body from the first position.

Claim 12

A radio handset according to claim 1 further comprising an additional key on the main body which is exposed when the extending portion is at the first position, wherein the additional key is connected to the processor and, upon an incoming call, places the radio handset in an off-hook condition when the additional key is actuated by a user.

Claim 13

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slidable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to place the handset in an off-hook condition with the extending portion in the first position with all of the plurality of keys concealed by the extending portion, the second position and at least one intermediate position, wherein the plurality of keys include a first group of alphanumeric keys and a second group of control keys including a call start key, and wherein the handset can be placed in the off-hook condition when the extending portion is concealing the call start key, wherein the processor is operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 14

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slidable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to place the handset in an off-hook condition with the extending portion in the first position with all of the plurality of keys concealed by the extending portion, the second position and at least one intermediate position, wherein the plurality of keys include a first group of alphanumeric keys and a second group of control keys including a call start key, and wherein the handset can be placed in the off-hook condition when the extending portion is concealing the call start key, wherein the processor is operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 15

A radio handset as claimed in claim 12 wherein the handset can be placed in the off-hook condition when the extending portion is in the first position.

Claim 16

A radio handset as claimed in claim 12 wherein the handset can be placed in the off-hook condition by the movement of the extending portion from the first position.

Claim 17

A radio handset as claimed in claim 12 wherein the handset can be placed in the on-hook condition by the movement of the extending portion into the first position.

Claim 18

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slidable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to perform respective predetermined functions responsive to respective sequences of actuations of the keys and operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position, the processor being operable to perform the predetermined functions corresponding to the respective sequences of actuations of exposed ones of the keys for a range of positions of the extending portion, the extent of exposure of the keys being dependent upon the extent of movement of the extending portion between the first position and the second position, the off-hook condition being activatable without pressing one of the keys by movement of the extending portion from the first position, wherein the processor is operable to place the handset in the off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 19

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slidable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to perform respective predetermined functions responsive to respective sequences of actuations of the keys and operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position, the processor being operable to perform the predetermined functions corresponding to the respective sequences of actuations of exposed ones of the keys for a range of positions of the extending portion, the extent of exposure of the keys being dependent upon the extent of movement of the extending portion between the first position and the second position, the off-hook condition being activatable without pressing one of the keys by movement of the extending portion from the first position, wherein the processor is operable to place the handset in the off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 20

A radio handset as in claim 16 wherein the processor is operable to automatically place the handset in the off-hook condition in response to the movement of the extending portion from the fist position only upon an incoming call.

Claim 21

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slideable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to perform respective predetermined functions responsive to respective sequences of actuations of the keys and operable to place the handset in an on-hook condition in response to the movement of the extending portion into the first position, the processor being operable to perform the predetermined functions corresponding to the respective sequences of actuations of exposed ones of the keys for a range of positions of the extending portion, the extent of exposure of the keys being dependent upon the extent of movement of the extending portion between the first position and the second position, the on-hook condition being activatable without pressing one of the keys by movement of the extending portion into the first position, wherein the processor is operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 22

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slideable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to perform respective predetermined functions responsive to respective sequences of actuations of the keys and operable to place the handset in an on-hook condition in response to the movement of the extending portion into the first position, the processor being operable to perform the predetermined functions corresponding to the respective sequences of actuations of exposed ones of the keys for a range of positions of the extending portion, the extent of exposure of the keys being dependent upon the extent of movement of the extending portion between the first position and the second position, the on-hook condition being activatable without pressing one of the keys by movement of the extending portion into the first position, wherein the processor is operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 23

A radio handset as in claim 18 wherein the processor is operable to place the handset in the on-hook condition in response to the movement of the extending portion into the first position only when the extending portion fully reaches the first position.

Claim 24

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slidable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to perform respective predetermined functions responsive to respective sequences of actuations of the keys and operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position, the operability of the processor to perform the respective predetermined functions responsive to the respective sequences of actuations of the keys being independent of the movement of the extending portion, the off-hook condition being activatable without pressing one of the keys by movement of the extending portion from the first position, wherein the processor is operable to place the handset in the off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 25

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slidable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to perform respective predetermined functions responsive to respective sequences of actuations of the keys and operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position, the operability of the processor to perform the respective predetermined functions responsive to the respective sequences of actuations of the keys being independent of the movement of the extending portion, the off-hook condition being activatable without pressing one of the keys by movement of the extending portion from the first position, wherein the processor is operable to place the handset in the off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 26

A radio handset as in claim 20 wherein the processor is operable to automatically place the handset in the off-hook condition in response to the movement of the extending portion from the first position only upon an incoming call.

Claim 27

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slidable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to perform respective predetermined functions responsive to respective sequences of actuations of the keys and operable to place the handset in an on-hook condition in response to the movement of the extending portion into the first position, the operability of the processor to perform the respective predetermined functions responsive to the respective sequences of actuations of the keys being independent of the movement of the extending portion, the on-hook condition being activatable without pressing one of the keys by movement of the extending portion into the first position, wherein the processor is operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 28

A radio handset comprising a housing having a key pad including a plurality of keys mounted on a main body and an extending portion mounted for longitudinal slidable movement between a first position in which the plurality of keys are concealed and a second position in which the plurality of keys are exposed, and a processor operable to perform respective predetermined functions responsive to respective sequences of actuations of the keys and operable to place the handset in an on-hook condition in response to the movement of the extending portion into the first position, the operability of the processor to perform the respective predetermined functions responsive to the respective sequences of actuations of the keys being independent of the movement of the extending portion, the on-hook condition being activatable without pressing one of the keys by movement of the extending portion into the first position, wherein the processor is operable to place the handset in an off-hook condition in response to the movement of the extending portion from the first position regardless of whether or not the extending portion has been moved to the second position.

Claim 29

A radio handset as in claim 22 wherein the processor is operable to place the handset in the on-hook condition in response to the movement of the extending portion into the first position only when the extending portion fully reaches the first position.