Coaster for glass

Details Coaster for glass Coaster for glass

1990-06-06

1991-03-19

Ramirez, Ramon O.

Supports

Supporting base

Coaster or caster cup

D 7510, 2151005, A47B 9100

Patent

active

050004131

ABSTRACT:
A coaster of this invention comprises an upper sheet having transparency and permeability, a printed sheet provided with a color-changing area of which surfaces faces the upper sheet, and a color former for changing the color-changing area. The color-changing area is printed by an ink containing a color-changing agent which changes from substantially invisible colorless state to a visible color state by applying a color former. The color former is set in the coaster such a way that the color former can melt out for applying to the color-changing agent by means of water permeating through the upper sheet.

REFERENCES:
patent: 3017051 (1962-01-01), Rosenfeld
patent: 3188040 (1965-06-01), Eichler
patent: 3195847 (1965-07-01), Squires
patent: 3515262 (1970-06-01), Ornstein et al.
patent: 4089498 (1978-05-01), Woodruff
patent: 4206570 (1980-06-01), Cooper
patent: 4336574 (1982-06-01), Goodman
patent: 4858872 (1989-08-01), Witt
patent: 4858873 (1989-08-01), Wilmoth et al.

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