A law the U.S. Congress passed in 1999 in a bid to level the playing field for patents has helped drag out the dispute between Research In Motion Ltd. (RIM) and NTP Inc., according to patent attorneys and other observers.

The American Inventors Protection Act for the first time let multiple parties get involved in the patent re-examination process at the U.S. Patent and Trademark Office (PTO). It affects one of the three NTP patents that have recently undergone re-examination and is one of several factors leading to a procedural marathon that could continue long after a possible injunction is imposed against RIM, attorneys said.

Attorneys also cite the extraordinary number of re-examination claims in the case, the introduction of new evidence along the way, lack of coordination between courts and the PTO and even a shortage of funding at the agency.

In a hearing Friday, Judge James Spencer of the U.S. District Court for the Eastern District of Virginia, in Richmond, heard arguments on whether to force RIM to stop selling devices and shut down service in the U.S. because it infringed patents held by NTP.

The patent office has now issued "final actions" on all three patents saying they are invalid, which would seem to shut down NTP's drive for an injunction. However, even those latest rulings are subject to a further appeal at the PTO.

Judge Spencer last year declined to put the case on hold for the re-examinations.

Doug Brady, chief information officer of accounting and consulting firm Plante and Moran LLP, is most concerned about the impending possible injunction but also irritated at the lengthy legal process.

"It's a pain to sit here and wait, and wait, and wait," Brady said. However, a PTO process that takes another two years would actually extend beyond his company's IT planning period, so he's not working out what to do if the patents are found invalid in the end.

The RIM lawsuit and patent re-examinations come at a time of heated debate over patents in the U.S. Other developments, such as Forgent Networks' lawsuits over a patent on part of the JPEG (Joint Photographic Experts Group) standard, also are raising questions about how the country's patent process affects innovation and industries. Some critics say it is being abused by companies that own patents only to extract licensing deals, while others say big companies use the patent process to bully small innovators.

NTP sued RIM in 2001 and after a long legal battle looks close to getting an injunction slapped on RIM. However, since the case was filed, new examples of "prior art" -- supposed evidence that NTP wasn't really the first to come up with the innovations in question -- have been presented. Based on those new examples, both RIM and the PTO have initiated re-examinations of NTP's patents. While the courts roll on using the evidence available at the time of the suit, the PTO is deciding whether the new facts mean NTP's patents aren't even valid.

The re-examination process was introduced in

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