US5892959, US5799198,US5758175, US5710929
I am searching for prior art before 31 Dec 1996 to invalidate these patents and have not had much luck. Vadem Corporation /St.Clair are involved in a number of patent suits. Thanks in advance.
This question is missing information necessary to easily research this patent application. Please add missing information to this prior art request, including: a patent number, at least one independent claim, a priority date (the date before which the prior art is needed) and a plain English description of the independent claim. See the prior art request template for more information and an example.