Frozen food indicators

• US 3,291,617 A
• Filed: 03/12/1963
• Issued: 12/13/1966
• Est. Priority Date: 03/12/1963
• Status: Expired due to Term

• Current Assignee: Howard F. Pratt, Robert A. Barker
• Original Assignee: Howard F. Pratt, Robert A. Barker
• Inventors: Barker, Robert A., Pratt, Howard F.
• Application Number:
  US04/264,636
• Time in Patent Office: 1,372 Days
• US Class Current: 116/221
• CPC Class Codes: B65B 25/001 of foodstuffs, combined with their conservation B65B25/041, B65B25/062, B65B25/067 take precedence
• CPC Class Codes: B65D 79/02 Arrangements or devices for indicating incorrect storage or transport B65D79/005 takes precedence ; measuring devices G01
• CPC Class Codes: G01N 31/229 for investigating time/temperature history

Claims

1. AN INDICATOR FOR FROZEN FOOD PACKAGES COMPRISING, IN COMBINATION A SUPPORT, AN ARM PIVOTED ON SAID SUPPORT FOR SWINGING OF AN END PORTION OF SAID ARM ABOUT A FIXED AXIS, SAID ARM EMBODYING MEANS RESPONSIVE TO TEMPERATURE FOR MOVING SAID END PORTION IN THE DIRECTION OF SAID AXIS TO POSITION SAID END PORTION VARIABLY IN ACCORDANCE WITH TEMPERATURE, MEANS YIELDABLY URGING SAID ARM TO ROTATE ON SAID AXIS, FIRST STOP MEANS CARRIED BY SAID SUPPORT AND PROVIDING A SURFACE ADAPTED TO BE ENGAGED BY SAID END PORTION ONLY AT TEMPERATURES GREATER THAN A FIRST PREDETERMINED VALUE WHEREBY AXIAL MOVEMENT OF SAID PORTION DURING COOLING RELEASES IT FROM SAID FIRST STOP MEANS AT SAID PREDETERMINED VALUE FOR ROTATION OF SaID ARM BY SAID URGING MEANS, SECOND STOP MEANS CARRIED BY SAID SUPPORT AND PROVIDING A SURFACE ADAPTED TO BE ENGAGED BY SAID END PORTION, AFTER RELEASE THEREOF FROM SAID FIRST STOP MEANS, ONLY AT TEMPERATURES BELOW A SECOND PREDETERMINED VALUE HIGHER THAN SAID FIRST PREDETERMINED VALUE WHEREBY A RISE IN TEMPERATURE ABOVE SAID SECOND PREDETERMINED VALUE RELEASES SAID ARM FROM SAID SECOND STOP MEANS FOR ROTATION TO A WARNING DISPOSITION.