Abstract: A footwear impulse-momentum device includes a first momentum actuator, a second momentum actuator, a position sensor, and a processing system, which are dimensioned to fit within a shoe sole. The first momentum actuator is coupled to receive a first control signal and is configured, upon receipt thereof, to move between a first position and a second position. The second momentum actuator is coupled to receive a second control signal and is configured, upon receipt thereof, to move between a third position and a fourth position spaced. The position sensor is configured to sense a position of the sole of the shoe and supply a shoe position signal representative thereof. The processing system is configured to receive the shoe position signal and is operable, in response thereto, to selectively generate and supply the first and second control signals to the first and second momentum actuators, respectively.

Abstract: A footwear impulse-momentum device includes a first momentum actuator, a second momentum actuator, a position sensor, and a processing system, which are dimensioned to fit within a shoe sole. The first momentum actuator is coupled to receive a first control signal and is configured, upon receipt thereof, to move between a first position and a second position. The second momentum actuator is coupled to receive a second control signal and is configured, upon receipt thereof, to move between a third position and a fourth position spaced. The position sensor is configured to sense a position of the sole of the shoe and supply a shoe position signal representative thereof. The processing system is configured to receive the shoe position signal and is operable, in response thereto, to selectively generate and supply the first and second control signals to the first and second momentum actuators, respectively.

Abstract: An envelope allows limited, yet sufficient, inspection of its contents for various types of contraband material, while simultaneously maintaining the privacy of a substantial portion of its contents. The envelope's front panel, back panel, and closure flap are each substantially opaque, and at least a portion of at least two of its edge portions on at least one of the front and back panels, are substantially transparent.