Title: Time-temperature integrating indicator device

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Claims: What is claimed is:

1. A temperature time integrating indicator device which comprises

an elongated envelope having generally co-extensive upper and lower walls each of a gas impermeable material, the walls being sealed together in a continuous course extending about the periphery of each, a first longitudinal portion of said envelope comprising a gas generation section within said envelope and a second longitudinal portion of said envelope comprising an indicating section within said envelope,

a gas generating material disposed in the gas generation section of said envelope,

an elongated wick disposed longitudinally of the envelope with one end thereof in said gas generation section, said wick extending a distance along said envelope indicating section and the other end thereof being remote from said gas generation section,

an indicator composition deposited on said wick, said indicator composition producing a color change in the presence of gas generated by said gas generating material, and

longitudinally disposed gas barrier means extending between said upper and lower walls immediately adjacent each longitudinal side margin of said wick and along substantially the full length of said wick for inhibiting gas transport at the longitudinal side margins of said wick whereby substantially all gas absorbed by said wick makes first contact with said wick at said one end thereof.

2. The device of claim 1 in which said gas barrier means comprises a sealed together connection of said upper and lower walls.

3. The device of claim 2 in which said upper and lower walls are each of material amenable to heat sealing, said gas barrier means comprising a heat-sealed joinder of said upper and lower walls.

4. The device of claim 1 in which said gas generating material is confined in an ampule of readily rupturable material, said ampule being fixedly disposed in the gas generation section of said envelope.

5. The device of claim 4 in which said ampule is a glass cylinder.

6. The device of claim 4 in which said ampule is enclosed in a resilient sleeve for preventing damaging the envelope structure when said ampule is ruptured.

7. The device of claim 4 in which said ampule is fixedly positioned in said first compartment by a strip of gas permeable material sealed to an inner surface by one of said upper and lower walls in a course encircling said ampule.

Other info:

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