Validity opinions are often sought before litigation related to a patent. These were the predecessors of the modern patent and trademark system. This was confirmed by posts from the U.S. Patent and Trademark website. The same reasoning applies to patent law. The USPTO opened an investigation and concluded by rejecting all claims in the patent. It is also possible to challenge the validity of a patent in court. Pike is the sole inventor named in US patent 4,555,775. Daguerre did not patent and profit from his invention in the usual way. And, IrisGL libraries were unsuitable for opening due to licensing and patent issues. The Chinese have claimed that GM didn't properly patent their technology. RIM sought an injunction to prevent Glenayre from infringing on RIM's "Single Mailbox Integration" patent. Ebenezer did not patent his invention and shared his techniques with anyone. The government has implemented various programs to foster innovation resulting in patent rights. Google has exclusive license rights on the patent from Stanford University. NetZero sued them for infringing on a banner ad patent.