Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Patent
1979-06-11
1984-05-15
Warden, Robert J.
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
374162, 2524081, 422 58, 426 88, 435 31, G01K 102, A23L 300, C09K 300, C12Q 122
Patent
active
044485484
ABSTRACT:
An improved steam sterilization indicator is provided. The indicator includes a fusible material, in tablet form, deposited in an embossment in one end of a thin aluminum backing. A wicking strip is attached to the backing with one end of the strip being in close proximity to the fusible tablet. A clear plastic material covers the tablet and the strip and is adhered to the backing. The melting point of the fusible tablet is depressed in the presence of saturated steam. Upon melt, the material in the tablet is absorbed by the wicking strip, producing a color front to provide an indication of the integration of time and temperature in the presence of steam. Various amounts of a binder are used in the tablet to provide a device which may be adjusted to reflect the thermal death curves of various types of microorganisms. The cover and the wick are bonded to the backing by an acrylic adhesive which also affects the rate of the indicator.
REFERENCES:
patent: 2889799 (1959-06-01), Korpman
patent: 3440144 (1969-04-01), Andersen
patent: 3479877 (1969-11-01), Allen et al.
patent: 3981683 (1976-09-01), Larsson et al.
patent: 4038873 (1977-08-01), Kimmel
patent: 4042336 (1977-08-01), Larsson
PyMaH Corporation
Warden Robert J.
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