Optical reading method

Coating processes – Transfer or copy sheet making – Reactive components

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

427152, 427209, B41M 312

Patent

active

053406060

ABSTRACT:
A method of optically reading colored record images formed by the reaction of a substantially colorless electron donating dye and an electron accepting developer in a pressure-sensitive recording sheet with a red light having a wavelength of from 620 nm to 700 nm, wherein the pressure-sensitive recording sheet comprises an electron accepting developer layer containing a metal salt of an aromatic carboxylic acid as the electron accepting developer and an electron donating dye layer containing a phthalide compound represented by the following formula (1) as the electron donating dye: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; the R.sub.1 and R.sub.2 or the R.sub.3 and R.sub.4 may combine with each other to form a ring; R.sub.5 represents a hydrogen atom or an alkyl group; R6, R.sub.7, R.sub.8, and R.sub.9 each represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a substituted amino group, or an alicyclic amino group; and X and Y each represents a hydrogen atom, an alkyl group, or an alkoxy group.

REFERENCES:
patent: 4820550 (1989-04-01), Naoki et al.
patent: 4822768 (1989-04-01), Ohga et al.
patent: 4835133 (1989-05-01), Yanagihara et al.
patent: 4849397 (1989-07-01), Sano et al.
patent: 4855282 (1989-08-01), Satomura et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Optical reading method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical reading method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical reading method will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-501456

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.