Chemistry: molecular biology and microbiology – Apparatus – Including measuring or testing
Patent
1981-02-09
1982-10-12
Warden, Robert J.
Chemistry: molecular biology and microbiology
Apparatus
Including measuring or testing
116207, 116216, 116217, 116219, 422 57, 435 31, 435291, 435805, 374106, 374160, C12M 100, G01D 2100, G01K 1100, C12M 134
Patent
active
043539904
ABSTRACT:
A device for monitoring thermal energy input and displaying the relationship of the thermal energy input to a selected time/temperature relationship. The device employs an indicating material which, when melted, expands and flows into a narrow channel to provide an irreversible, visible indication of the thermal energy to which the device has been exposed.
REFERENCES:
patent: 3055759 (1962-09-01), Busby et al.
patent: 3362834 (1968-01-01), Kaye
patent: 3521489 (1970-07-01), Finkelstein
patent: 3962920 (1976-06-01), Manske
patent: 3981683 (1976-09-01), Larsson et al.
patent: 4134359 (1979-01-01), Redpath
patent: 4148272 (1979-04-01), Wetzold
Hawkins Paul M.
Manske Wendell J.
Alexander Cruzan
Bovee Warren R.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Warden Robert J.
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