I also found something interesting on a lawsuit about Mr. Rosenfield that might have lead to the untimely demise of this suction sweeper. I believe it relates to this cleaner, I don't think he made any other one/
https://cite.case.law/f/234/942/
"On the question of an accounting, an interesting situation has arisen. I still remain satisfied that defendant was not a willful in-fringer. I think that Rosenfield conscientiously tried to avoid the Kenney patent. lie evidently saw the commercial possibilities of a small portable machine, which the housewife could operate, and for all practical purposes succeeded in producing a useful commercial article. He waited until the Cummings patent expired, and first put his machine on the market in the early part of 1910. Undoubtedly more was claimed for the Cummings machine by plaintiff’s predecessor than that machine was entitled to, and the fact that Rosenfield thus waited is some evidence of his desire to avoid infringement of an existing patent."
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"Throughout this period defendant was showing its machines at public exhibitions, was working in the open, and, in brief, was notoriously carrying on its business. It is plain that for some reason plaintiff concluded not to sue defendant until after the decision on September 30, 1915, in the American Rotary Valve Co. Case.
I am inclined to think that plaintiff thought the wise course was to refrain from suit, or threatening suit, until the American Rotary Valve Case was decided; but, whatever may have been the motive, the fact remains that plaintiff stood by from the fall of 1910 until October, 1915, and deliberately acquiesced in the sale of defendant’s machines."
