Those include China Film Giant Screen, which was co-developed by the China Film Group and will play “RoboCop” on its large-format screens in China, following its conversion to 3-D by a company called Beijing Cubic Pictures Technology. Mr. Tsui has been identified by Imax as the chief engineer for the C.F.G.S. system, which Imax says was developed from its technology, and as having founded Cubic Pictures after supposedly misappropriating Imax’s 2-D to 3-D conversion methods.

In an email last week, Mr. Tsui strongly disputed Imax’s claims that he had stolen its technology. Calling the infringement accusations against him “utterly false,” he said, “I’m a former Imax employee being scapegoated when the company chooses not to face competitive environment, ever-changing technology, and the dislikes of market monopoly and itself.”

Separately, a lawyer for the China Film Group said that the China Film Giant Screen venture “is not involved in the matter of technology infringement” described in several Imax court filings. He said the matter should be left for courts to resolve.

The Imax dispute with Mr. Tsui and others is still playing out in courts here, in China, and in Canada. In Ontario, Imax won an injunction ordering Mr. Tsui to stop competing with Imax pending trial, and the court later ordered Mr. Tsui detained — though he has remained free, and apparently outside of Canada — for failing to comply with its orders.

In August, Imax filed a lawsuit in the Los Angeles County Superior Court against GDC Technology, a digital information display company based in Burbank, Calif., that is associated with a Hong Kong-based parent. The Burbank company, which has been planning a public offering in the United States, is accused by Imax of selling the C.F.G.S. system that Imax says is based on technology stolen by Mr. Tsui.

According to court documents, settlement talks are underway in that suit. GDC has not formally responded to the accusations. But Robert N. Schwartz, a lawyer for the company, last week denied that GDC was using stolen technology.

In a statement, an Imax representative said the company would continue to pursue Mr. Tsui, and might consider “further actions” against others connected to its misappropriated trade secrets. But the company also acknowledged that it had been working toward an accommodation with the Chinese.