Personal alarm apparatus
First Claim
1. Alarm apparatus comprising electrical circuit means including controller means for generating a variable frequency repetitive sound wave having at least two different predetermined frequencies which occur within a predetermined interval of time, and a resonator for generating a predetermined clock frequency for the sound wave.
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Accused Products
Abstract
Alarm apparatus which generates a repetitive sound wave having at least two pulses of predetermined frequencies within a predetermined interval of time. A resonator generates the clock frequency therefor. The resonator may have a low tolerance of less than about 0.1 percent so that at least two pulses may be detected by a receiver having a similarly low tolerance so that false triggering of the receiver by other transmitters or background noise may be prevented. A plug is inserted into the alarm housing to maintain circuitry for initiating operation thereof open. Pulling of the plug from the housing allows the circuitry to close to initiate operation of the alarm. A push button is provided on the end of the plug to close the circuitry for initiating operation of the alarm while the plug is inserted into the apparatus. Once the alarm has been initiated, the circuitry is such that the alarm cannot be inactivated except by removal of the internal power source.
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Citations
20 Claims
- 1. Alarm apparatus comprising electrical circuit means including controller means for generating a variable frequency repetitive sound wave having at least two different predetermined frequencies which occur within a predetermined interval of time, and a resonator for generating a predetermined clock frequency for the sound wave.
- 7. Alarm apparatus comprising electrical circuit means including controller means for generating a variable frequency repetitive sound wave having at least two different predetermined frequencies which occur within a predetermined interval of time, a resonator for generating a predetermined clock frequency for the sound wave, means for receiving the sound wave including means for detecting said at least two predetermined frequencies within said predetermined interval of time, and means responsive to the detecting of said at least two predetermined frequencies within said predetermined interval of time for initiating a predetermined action.
- 12. Alarm apparatus comprising a housing, electrical circuit means including controller means within said housing for generating a sound wave and having means defining a first port and a second port, a power supply means within said housing, first circuit means for applying power to said first port to initiate operation of said controller means, second circuit means for applying power from said power supply means to said second port after operation of said controller means is initiated for continued operation of said controller means, said controller means continuing to operate after operation thereof is initiated as long as power is applied by said second circuit means to said second port, said second circuit means being free of switches between said power supply means and said second port, and plug means adapted to be inserted into said housing for opening said first circuit means whereby pulling said plug means from said housing closes said first circuit means to apply power to said first port for initiating operation of said controller means after which said controller means continues to operate until the application of power to said second port is ceased, the apparatus further comprising switch means connected to said plug means, said plug means comprising a first circuit portion and a second circuit portion insulated from said first circuit portion, means for disconnecting said power supply means from said first port and for connecting said first circuit portion to said power supply means and said second circuit portion to said first port during a period of time when said plug means is inserted into said housing, said switch means including means for connecting said first circuit portion to said second circuit portion for applying power from said power supply means to said first port during a period of time when said plug means is inserted into said housing.
- 17. Alarm apparatus comprising a housing, electrical circuit means including controller means within said housing for generating a sound wave and having means defining a first port and a second port, a power supply means within said housing, first circuit means for applying power to said first port to initiate operation of said controller means, second circuit means for applying power from said power supply means to said second port after operation of said controller means is initiated for continued operation of said controller means, said controller means continuing to operate after operation thereof is initiated as long as power is applied by said second circuit means to said second port, said second circuit means being free of switches between said power supply means and said second port, and plug means adapted to be inserted into said housing for opening said first circuit means whereby pulling said plug means from said housing closes said first circuit means to apply power to said first port for initiating operation of said controller means after which said controller means continues to operate until the application of power to said second port is ceased.
- 19. Alarm apparatus comprising a housing, electrical circuit means including controller means within said housing for generating a sound wave and having means defining a first port and a second port, a power supply means within said housing, first circuit means for applying power to said first port to initiate operation of said controller means, second circuit means for applying power from said power supply means to said second port after operation of said controller means is initiated for continued operation of said controller means, said controller means continuing to operate after operation thereof is initiated as long as power is applied by said second circuit means to said second port, said second circuit means being free of switches between said power supply means and said second port, and plug means adapted to be inserted into said housing for opening said first circuit means whereby pulling said plug means from said housing closes said first circuit means to apply power to said first port for initiating operation of said controller means after which said controller means continues to operate until the application of power to said second port is ceased, the apparatus further comprising switch means connected to said plug means for closing said first circuit means during a period of time in which said plug means is inserted into said housing.
Specification