I was wondering if the Tree Lounge Advantage patents (e.g., US 5,954,158) are available to be purchased? I know the company has since closed. Have they expired or are they still valid? Any help would be great.
On the Google Patents page for this patent, look under Legal Events and you will see:
Nov 13, 2007 FP Expired due to failure to pay maintenance fee Effective date: 20070921
The patent is expired since September 9, 2007.
If you are interested in the detailed history of the patent, refer to the USPTO Public Pair database.