Indicating the condition of a surface

Details Indicating the condition of a surface Indicating the condition of a surface

1987-10-05

1989-03-21

Yost, Frank T.

Printed matter

Having revealable concealed information, fraud preventer or...

Having specific color

283 74, 283 91, 116201, B42D 1500, G09F 1900, G09F 300, G01D 1100

Patent

active

048137120

ABSTRACT:
A pattern is applied to a particular surface in order to detect whether that the surface is in a concave or convex state. One set of regions within the surface bear one color or other coherent appearance, and another set bear a different color or a different coherent appearance. When the surface is in a convex state, light is predominantly reflected from one set of regions, whereas, in the concave state light is reflected from the other set of regions. In this way a clearly visible indication is given of the state of the surface. The surface can, for example, be part of a vacuum pack containing foodstuffs so as to indicate whether the vacuum in the pack remains or has been broken.

REFERENCES:
patent: 362820 (1887-05-01), Craige
patent: 1422527 (1922-07-01), Berger
patent: 1869221 (1932-07-01), Latzko et al.
patent: 4066280 (1978-01-01), La Capria
patent: 4184700 (1980-01-01), Greenaway
patent: 4250217 (1981-02-01), Greenaway
patent: 4589686 (1986-05-01), McGrew
patent: 4711690 (1987-12-01), Haghiri-Tehrani
patent: 4715623 (1987-12-01), Roule
RCA Anti Counterfeit Label, TN No. 903, Feb. 1, 1972.

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