Homework 1/28 (John Gallagher)

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  • The patent I choose, number 4304169, was for a method of noise reduction in a Maypole type braiding machine, the invention of Francis S. Cimprich et al. This improvement of the braiding machine was found to be worthy of a patent in 1981 when the patent was granted, but it may not have been at various other points in U.S. history, due to the changing standards for patentability. We will consider here whether this invention would be considered patentable under the different standards in the cases Hotchkiss v. Greenwood, A. & P. Tea Co. v. Supermarket Corp., and Lyon v. Bausch & Lomb.
  • Certainly the idea of this type of braiding machine was not new at the time of Cimprich's patent. The machine employs spools of wires or fibers which are wrapped around a thin core in order to produce rope, candle wicks, or in this case, hose. The spools move in a circle around the hose, wrapping the wires or fibers in criss-crossed pattern. This criss-cross is achieved by weaving the spools in and out from each other as they move around the hose. This motion is guided by two interwoven sinusoidal paths cut in the supporting rings. The spools move along these paths and the fibers are interwoven, much in the same way ribbons are wrapped around a Maypole. This idea had existed at least since 1934, since it was patented in patent number 1,983,222[1].
  • This idea had certainly existed before, but the Maypole braiding machines had always been very loud, putting the operators in danger of damaging their hearing. Cimprich patented the idea of dampening the noise causing vibrations by placing a layer of visco-elastic material between the two plate which made up the ring, called the 'deck' guiding the spools. The motion of the spools in the paths on the deck is the main source of noise, so placing some viscoelastic material between the plates of the deck would absorb some of the noise-causing vibrations. This was not the first attempt to reduce the noise produced by the braiding machine. In 1975 Max Ostermann filled for a patent in Germany for a method of noise reduction in braiding machines. His invention focused on the shape of the guides for the spools, but the patent also claims "the invention provides for the provision of a zone or portion of noise dampening material, particularly synthetic plastic material at the marginal portion of a respective sector of the plate, or where the contact point is located." The plate referred to here is not the deck, but a Geneva gear which transfers the motion of the spool. The contact point is between the spool and the gear. Thus some time prior to Cimprich's improvement, Ostermann had already come up with the idea of reducing the noise using a material which would absorb vibrations. Ostermann had the idea to apply this method to the gears and the spool itself. Cimprich later applied the idea to the deck, to which the gears and spools were attached.