Chemistry: analytical and immunological testing – Process or composition for sterility or package integrity test
Patent
1990-03-16
1993-10-19
Johnston, Jill A.
Chemistry: analytical and immunological testing
Process or composition for sterility or package integrity test
436 2, 422 56, 422 57, 422 58, 422 8212, 426 87, 426 88, 116216, G01N 3100, A22C 1710
Patent
active
052544737
ABSTRACT:
An indicator composition and process capable of changing color in relationship to its exposure to a temperature above and below a base line temperature and to the time of said exposure, for monitoring the time-temperature history of a substrate, depositable as a layer on said substrate, comprising a dispersion of either a binder comprising a reaction inert, neutral finely divided absorbent, in the presence of a reactant comprising a salt of an acid or an organic compound substituted by at least one moiety which, in ionic form, is an anion or a binder/reactant, comprising at least one solid organic polymer whose constituent units contain, as a covalent substituent, at least one moiety which, in ionic form, is an anion; as indicator, at least one acid sensitive pH dye and as activator, at least one base. This composition and process may be utilized to form a solid state device for monitoring integral values of time and temperature during storage of perishables. The device is a single solid indicating layer deposited upon a substrate. The time required for the color change and the activation energy of the device can be varied by varying the concentration and nature of reactants, catalysts, additives and polymeric binder/reactant matrix. The color change can be gradual or abrupt and exhibited as a continuous strip, as alphanumeric symbol(s) or as a line array which can be read by a bar code reader.
REFERENCES:
patent: 2735783 (1956-02-01), Tamblyn
patent: 3290499 (1966-12-01), Vale
patent: 3366480 (1968-01-01), Gaynor
patent: 3461288 (1969-08-01), Oster
patent: 3743846 (1973-07-01), Matsumoto
patent: 3845662 (1974-11-01), Surgina et al.
patent: 3899677 (1975-08-01), Hori
patent: 3933885 (1976-01-01), Satomura
patent: 3942467 (1976-03-01), Witonsky
patent: 3977945 (1976-08-01), Tornmarck
patent: 3999946 (1976-12-01), Patel
patent: 4001587 (1977-01-01), Panchenkov
patent: 4065430 (1977-12-01), Satomura
patent: 4154107 (1979-05-01), Giezen et al.
patent: 4238352 (1980-12-01), Patel
patent: 4280441 (1981-07-01), McNeely
patent: 4675161 (1987-06-01), Hashimoto et al.
patent: 4698296 (1987-10-01), Lewis
patent: 5045283 (1991-09-01), Patel
patent: 5053339 (1991-10-01), Patel
Zall et al., Dairy and Food Sanitation, 6(7), 285-290 (1986) in FSTA 87: 2452.
Dahlig et al., Polimery (Warsaw) 31(6) pp. 211-213 (1986), in Chemical Abstract, 26, 228734q.
Pozdnyakovu, et al., Tr. Mosk. Khim.-Tekhnol. Inst. No. 61, pp. 237-240 (1969) in Chemical Abstract, 6, 26160j.
"Shelf-Life Dating of Foods"-T. P. Labuza, pp. 154,238 Food and Nutrition Press, Connecticut (1982).
Bhat N.
Johnston Jill A.
JP Laboratories
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