Granted Patent
Utility
US 6,654,546 · App. 09/412,994
Field upgradeable recording device
Inventors:
Dan Levin, Tom Carhart, Matthew Self
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: Oct 5, 1999
Inventors
Dan Levin
Tom Carhart
Matthew Self
Assignee (at issue)
Digital Networks North America, 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.