4 patents
Utility
Leuco dye pastel coloring kit
16 Feb 21
A leuco dye pastel marking device for use with a substrate treated with an activator of the leuco dye, such that drawing upon the substrate will reveal a color, but drawing on a normal surface will have no visible effect.
Terry W. Stovold, JoAnn Domanski
Filed: 7 Feb 20
Utility
Leuco Dye Pastel Coloring Kit
10 Jun 20
A leuco dye pastel marking device for use with a substrate treated with an activator of the leuco dye, such that drawing upon the substrate will reveal a color, but drawing on a normal surface will have no visible effect.
Terry W. Stovold, JoAnn Domanski
Filed: 6 Feb 20
Utility
Leuco dye pastel marking device
23 Mar 20
A leuco dye pastel marking device for use with a substrate treated with an activator of the leuco dye, such that drawing upon the substrate will reveal a color, but drawing on a normal surface will have no visible effect.
Terry W. Stovold, JoAnn Domanski
Filed: 12 Apr 18
Utility
Leuco Dye Pastel Marking Device
16 Oct 19
A leuco dye pastel marking device for use with a substrate treated with an activator of the leuco dye, such that drawing upon the substrate will reveal a color, but drawing on a normal surface will have no visible effect.
Terry W. Stovold, JoAnn Domanski
Filed: 12 Apr 18
- Prev
- 1
- Next
Patents are sorted by USPTO publication date, most recent first