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Class Information
Number: 503/222
Name: Record receiver having plural interactive leaves or a colorless color former, method of use, or developer therefor > Having a colorless color-former, developer therefor, or method of use > Identified color-former > Furanone moiety-containing > Fluoran or derivative > Molecule having plural fluorans or more than three rings fused together
Description: Subject matter in which the color former compound has in its molecule two or more fluoran moieties, or has a polycyclo ring system in which a ring shares two of its carbon atoms with one other ring, and two more of its carbons with second other ring.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6962763 |
Silver-free black-and-white thermographic materials |
Nov. 8, 2005 |
| 6432876 |
Image-recording medium containing self-developing leuco dye |
Aug. 13, 2002 |
| 5340537 |
Temperature indicating compositions |
Aug. 23, 1994 |
| 5300473 |
Recording material comprising crystal of fluoran compound |
Apr. 5, 1994 |
| 5154668 |
Single paper sheet forming a two-sided copy of information entered on both sides thereof |
Oct. 13, 1992 |
| 4929411 |
Heat-sensitive recording material |
May. 29, 1990 |
| 4721702 |
Pressure-sensitive recording material |
Jan. 26, 1988 |
| 4720450 |
Thermal imaging method |
Jan. 19, 1988 |
| 4720449 |
Thermal imaging method |
Jan. 19, 1988 |
| 4720301 |
Reversible heat sensitive recording composition |
Jan. 19, 1988 |
| 4592957 |
Microcapsules having walls of polyaddition products of water-insoluble polyamines with water-soluble polyisocyanate adducts |
Jun. 3, 1986 |
| 4169183 |
9-Dialkylamino-spiro [6H-[1]benzopyrano[3,2-g]quinoline-6,1'(3'H)-isobenzofuran]-3'-one compounds and pressure-sensitive recording system therewith |
Sep. 25, 1979 |
| 4007195 |
Heterocyclic substituted fluorans |
Feb. 8, 1977 |
| 3996406 |
2-Phenyl-1,2,3-triazolofluoran compounds |
Dec. 7, 1976 |
| 3988492 |
Pressure sensitive copy paper employing pyrazoloxanthene compounds |
Oct. 26, 1976 |
| 3985930 |
Cyclopolymethylenefluoran compounds |
Oct. 12, 1976 |
| 3970671 |
Chromogenic compounds and method for preparation thereof |
Jul. 20, 1976 |
| 3954803 |
Dilactone chromogenic compounds and preparation thereof |
May. 4, 1976 |
| 3930672 |
Pressure-sensitive copying paper containing lactone compounds derived from pyridine-carboxylic acid |
Jan. 6, 1976 |
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