Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Component noncoextensive with substrate
Patent
1987-03-10
1990-06-19
Hess, Bruce H.
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Component noncoextensive with substrate
503200, 503215, 503226, B41M 516
Patent
active
049354019
ABSTRACT:
A sheet is provided which upon abrasion of one surface will reveal a preprinted message without removal of a cover layer.
REFERENCES:
patent: 3503783 (1970-03-01), Evans
patent: 4036511 (1977-07-01), Maalouf
patent: 4360548 (1982-11-01), Skees et al.
patent: 4533567 (1985-08-01), Marinelli
patent: 4642662 (1987-02-01), Torii et al.
Hess Bruce H.
Kirn Walter N.
Litman Mark A.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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