Mattress alarm

• US 3,325,799 A
• Filed: 07/13/1964
• Issued: 06/13/1967
• Est. Priority Date: 07/13/1964
• Status: Expired due to Term

• Current Assignee: Robert L. Farris
• Original Assignee: Robert L. Farris
• Inventors: Farris, Robert L.
• Application Number:
  US04/382,251
• Time in Patent Office: 1,065 Days
• US Class Current: 340/573.1
• CPC Class Codes: A61B 2562/0261 Strain gauges
• CPC Class Codes: A61B 5/11 Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb for measuring pulse A61B5/02 ;A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721
• CPC Class Codes: A61B 5/113 occurring during breathing
• CPC Class Codes: A61B 5/6892 Mats

Claims

1. IN AN ALARM INCLUDING A MATTRESS, A STRAP EXTERIORLY ENCOMPASSING SAID MATTRESS AND HAVING OPPOSITE ENDS TERMINATING AT A SIDE OF SAID MATTRESS, AN ELECTRICAL RESISTANCE TYPE STRAIN GAUGE HAVING ITS OPERATIVE OPPOSITE ENDS RESPECTIVELY ATTACHED TO SAID OPPOSITE ENDS OF SAID STRAP, MEANS PROVIDING AN ELECTRICAL POTENTIAL ACROSS THE RESISTIVE COMPONENT OF SAID STRAIN GAUGE, ELECTRICAL PULSING MEANS FOR PRODUCING A PULSE FOR SUBSTANTIALLY EACH CHANGE IN ELECTRICAL CURRENT FLOWING THROUGH SAID RESISTIVE COMPONENT OF SAID STRAIN GAUGE, AND ALARM MEANS CONNECTED TO SAID PULSING MEANS AND RESPONSIVE TO THE PROLONGED ABSENCE OF ELECTRICAL PULSES OF SAID PULSING MEANS.