Signal device for food package
United States Patent 2951764
US Patent References:
Telltale for frozen food packages
- - 2460215

Temperature indicator
- - 2490933

Defrosting indicator
- - 2560537


Inventors:
Chase, Kenneth J.
Publication Date:
09/06/1960
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Assignee:
Chase, Kenneth J.
Primary Class:
426/88
Other Classes:
116/206
International Classes:
G01N31/22