Opening of envelope with darkened edges
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United States of America Patent
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-
Sep 16, 1980
Grant Date -
N/A
app pub date -
Feb 5, 1979
filing date -
Feb 5, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is provided for the opening of envelopes made of cellulosic paper by the action of a chemical degradation agent in the presence of radiant heat in which the radiant heat is generated from a source maintained at a temperature high enough to produce a substantial amount of radiation having a wave length of 2 microns or less and by applying to the edges to be opened a darkening material capable of absorbing a substantial portion of the incident radiant energy.
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