Record receiver having plural interactive leaves or a colorless color former, method of use, or developer therefor
Patent class list (only not empty are listed)
Deeper subclasses:
Class / Patent application number | Description | Number of patent applications / Date published |
---|---|---|
503200000 | HAVING A COLORLESS COLOR-FORMER, DEVELOPER THEREFOR, OR METHOD OF USE | 221 |
503227000 | HAVING PLURAL INTERACTIVE LEAVES | 8 |