29
/
en
AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
April 1, 2024
3615009
330036
2
Create
Public Timelines
Library
FAQ
For education
Cabinet
For educational institutions
For teachers
For students/pupils
feb 11, 1997 - US5600853A Award date: 2/11/1997 Status: Expired
Added to timeline:
18 Dec 2019
0
0
241
Patent timeline
Date:
feb 11, 1997
Now
~ 27 years ago