Yeah I'm not sure what version is being discussed then, you might have to dig around more old legal dockets from the era, legalese is hard to interpret especially from the early 20th century.
But looking at the document it looks like the entire thing started in 1910 when Kenny believed that Rosenfield had infringed on his suction sweeper patent and letters started being mailed back and forth. So I would presume whatever he was working on around 1910. and then for whatever reason Kenny waited until after the Rotary Valve case was resolved to decide that he should sue Rosenfield (5 years).
"On November 1, 1910, a letter was sent by plaintiff company to the Rosenfield Manufacturing Company (the original name of defendant company), notifying the latter of its infringement of the patent in suit, and threatening a lawsuit. On November 12, 1910, Mr. Kent, the attorney for the Rosenfield Company, replied, stating, in effect, that he had advised his client that the “suction cleaner manufactured and sold by it does not infringe any of the claims of this patent,” and asking for the numbers and dates of “any other patents owned by the Vacuum Cleaner Company which you think my client is infringing.”"