Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1998-04-07
1999-03-02
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
With particular system function
340541, 340628, 3406935, G08B 1900
Patent
active
058776842
ABSTRACT:
A sensor equipped portable alarm device that also has an input port for connecting to an external sensor so that either the internal sensor or the external sensor can be selected using a sensor select switch. Furthermore, the alarm device has a timer for setting a delay time so that errors arising from immediate action on start-up can be avoided. In addition, the device has a magnetic base for mounting on a magnetic surface and dismounting when the device is no longer needed. Moreover, a rechargeable internal battery is used as an internal power source for the whole device, but power drawn from an external power source can also be used as well. Therefore, the device is portable and can be used anywhere.
REFERENCES:
patent: 4716402 (1987-12-01), Francis
patent: 4841282 (1989-06-01), Reis
patent: 5309145 (1994-05-01), Branch et al.
patent: 5751214 (1998-05-01), Cowley et al.
patent: 5786767 (1998-07-01), Severino
Hofsass Jeffery A.
Lieu Julie B.
United Microelectronics Corp.
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