The value of the Flash Patents is obvious, companies are settling lawsuits. It looks as if the four most enforced patents are 5,742,737:5,491,774: 5,842,170: 5,839,108

Here's a link to our progress in the e.Digital Flash-R Patent Infringement Cases.

e.Digital Flash-R Patent Infringement Cases
https://docs.google.com/spreadsheet/pub?key=0Ah9NLDCScshndDZyME9CVkMyZl9YbVRwdDk1amY2TVE&output=html

e.Digital's Flash-R™ Patent Portfolio
http://edigital.com/index.php?option=com_content&view=article&id=4

e.Digital's Flash-R™ patent portfolio contains fundamental technology essential to the utilization of flash memory in today's large and growing portable electronic products market.

In 1993, e.Digital developed & began marketing the first digital voice recorder with removable flash memory, powered by e.Digital’s then newly developed MicroOS®. In 1996, e.Digital produced and began marketing the first digital voice recorder interface for downloading and managing voice recordings on the PC.

The Flash-R™ portfolio is protected through the years 2014 - 2016.
e.Digital has engaged the legal firm Handal & Associates to manage certain patent enforcement matters on a partial contingent fee basis.

US5491774:
Handheld record and playback device with flash memory
http://www.google.com/patents/US5491774

US5742737:
Method for recording voice messages on flash memory in a hand held recorder
http://www.google.com/patents/US5742737

US5787445:
Operating system including improved file management for use in devices utilizing flash memory as main memory
https://www.google.com/patents/US5787445

US5839108:
Flash memory file system in a handheld record and playback device
http://www.google.com/patents/US5839108

US5842170:
Method for editing in hand held recorder
http://www.google.com/patents/US5842170