Telltale device

Details Telltale device Telltale device

1975-10-29

1976-07-06

Swisher, S. Clement

Signals and indicators

Alarms

Fluid flow

73356, 73358, 426 88, G01K 1108

Patent

active

039675793

ABSTRACT:
A telltale device for perishable products including a layer of temperature sensitive material having a clearly defined melting point and an indicator layer separated by a diffusion barrier formed of natural and synthetic gels which permits diffusion of the temperature sensitive material through the barrier at a controlled rate for contact with the indicator after a prescribed period of time at or above the melting point of the material. The temperature sensitive material and diffusion rate of the barrier are selected so that the device, when affixed to a product, visually indicates if the product has been held at or above its deterioration temperature for sufficient period to affect the quality of the product.

REFERENCES:
patent: 2614430 (1952-10-01), Ballard
patent: 3055759 (1962-09-01), Busby
patent: 3175401 (1965-03-01), Geldmacher
patent: 3243303 (1966-03-01), Johnson
patent: 3362834 (1968-01-01), Kaye
patent: 3665770 (1972-05-01), Sagi
patent: 3695903 (1972-10-01), Telkes
patent: 3765243 (1973-10-01), Pickett
patent: 3871232 (1975-03-01), Pickett
patent: 3895523 (1975-07-01), Nollen

Affiliated with

Also associated with

Rating

Telltale device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Telltale device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telltale device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1528272