Title:
Mattress alarm
United States Patent 3325799
US Patent References:
/0884121.html
- - 0884121

Automatic alarm switch
- - 1969554

Circuit closer
- - 2260715

Sound pickup and reproducing apparatus
- - 2666650

Sleep warning device
- - 2726380


Inventors:
Farris, Robert L.
Publication Date:
06/13/1967
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Assignee:
Edwia, Greines Cohen
Primary Class:
340/573.100
Other Classes:
600/595, 250/231.100, 250/221, 250/208.400, 340/665
International Classes:
A61B5/11; A61B5/113
US Patent References:
2787834Grating strain gauges
2831181Respiration monitoring device
3002185
3034341Devices for the determination of mechanical strains
3163856Alarm device for indicating lack of motion
3184961Optical strain gauge
Foreign References:
GB919765A