Resin molded productions designed to display extinction of activ

Details Resin molded productions designed to display extinction of activ Resin molded productions designed to display extinction of activ

1980-03-20

1981-07-21

Turk, Arnold

Signals and indicators

Indicators

356256, 116201, 422 57, 424 7, 428907, 428913, G01N 2117

Patent

active

042792134

ABSTRACT:
In a resin molded controlled-release product which comprises a volatile or elutable active agent dispersed in a substantially transparent and inert resin molded material, the improvement which comprises a colored material located inside or on the back surface of the molded product which is not visible through the product at the initial concentrations of the active agent, but is visible through the resin product at concentrations of the active agent at which the activity of the product is substantially extinct.

REFERENCES:
patent: 4062649 (1977-12-01), Kuderna et al.

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