Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1975-09-11
1976-12-14
Queisser, Richard C.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73358, 1161145, G01K 1120, G01K 102
Patent
active
039968022
ABSTRACT:
A device for testing the level, uniformity and duration of the temperature in a sterilization apparatus, such as a steam sterilizer or the like. The device comprises a unitary support means adapted to be positioned in the sterilization apparatus. First temperature responsive means is arranged in a predetermined manner on one surface of the support means. The first means is adapted to change condition, e.g., color, when exposed to a predetermined temperature to indicate the uniformity of the temperature to which the support means is exposed in the sterilization apparatus. A second temperature responsive means is mounted on the support means substantially at the center portion thereof. In practice, the second means changes condition when exposed to a selected temperature for a predetermined time period, thereby indicating whether the center portion of the support means has been exposed to the selected temperature for a sufficient time period. The second means may also be used to indicate excessive conditions such as temperature and/or time which could be due to superheating or other sterilization apparatus malfunction.
REFERENCES:
patent: 1894015 (1933-01-01), Bernstein
patent: 2579738 (1951-12-01), Hargreaves
patent: 3114349 (1963-12-01), Schuman
patent: 3523011 (1970-08-01), Bhiwandker et al.
patent: 3695903 (1972-10-01), Telkes et al.
patent: 3754465 (1973-08-01), Romito et al.
Appleman John S.
Queisser Richard C.
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