Title: Time-temperature integrating indicator device

Abstract: Temperature time integrating indicator device in which a gas generating material located at one end of the device and activated at time of use of the device is absorbed by an indicating wick extending in the device in a direction away from the gas source, which wick changes color to denote a time-temperature integral and hence the temperature history of a product, there being a gas barrier means extending along the longitudinal sides of the wick for inhibiting gas transport to insure that substantially all gas absorbed by the wick makes first contact with the wick at the end nearest the gas source thus precluding first gas contact with the wick at more remote location with consequent erroneous temperature history indication.

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Inventors: Fang, Shou-Mean (Lake Hiawatha, NJ, US)
Hof, Craig R. (Boonton, NJ, US)

Application Number: 515165
Filing Date: 1974-10-16
Publication_date: 1976-01-13
Assignee: Bio-Medical Sciences, Inc. (Fairfield, NJ)
Primary Class(es): 422/119 116/216, 374/102, 422/87
Other Classes:
US Patent Ref:

2552477	May, 1951	Cole	73/339.
2671028	Mar, 1954	Clark	116/114.
3414415	Dec, 1968	Broa, Jr.	116/114.
3697227	Oct, 1972	Goldstein et al.	23/254.

Other Refs:
Primary Examiner: Serwin, R. E.
Assistant Examiner:
Attorney: Lagani, Jr.; Anthony