Granted Patent
Utility
US 5,469,538 · App. 08/206,307
Mathematical document editor and method performing live symbolic calculations for use with an electronic book
Inventor:
Allen M. Razdow
Patented Case
View Patent ↗
Granted: Nov 21, 1995
Filed: Mar 4, 1994
Inventor
Allen M. Razdow
Assignee (at issue)
Mathsoft, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.