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US 4,289,088 AGranted
Sterility indicating device
AssigneeMinnesota Mining and Manufacturing Company
InventorJohn V. Scibelli
Life of this patent
Estimating the term…
Abstract
A device for indicating the attainment of a sterile condition in an autoclave is described. The device provides a yes/no indication of the attainment of sterility through the use of a fusible material to prevent premature indication. The fusible material has the formula ##STR1## wherein said --OR.sup.1 group is located ortho or meta to said ##STR2##
Claims9
A device for indicating the attainment of sterility in a steam autoclave comprising
- an elongate hollow element having means for permitting steam to enter the hollow portion thereof;
- an indicating means within said hollow element that is movable relative to said hollow element;
- a biasing means for causing movement of said indicating means relative to said hollow element;
- and
- a restraining means within said hollow element for preventing movement of said indicating means until the attainment of a predetermined temperature in the presence of steam, whereupon said restraining means fuses and permits said biasing means to move said indicating means relative to said hollow element thereby indicating the attainment of sterility, said restraining means having the formula ##STR6## wherein R.sup.1 is a lower alkyl group containing from 1 to about 4 carbon atoms, and R.sup.2 is selected from hydrogen and lower alkyl groups containing from 1 to about 4 carbon atoms, and wherein said --OR.sup.1 is located ortho or meta to said ##STR7##
2 more elements
Dependencies are inferred from the claim text.