Homework 2: Validity of "Combinations"
Hotchkiss v. Greenwood
Under the court ruling in Hotchkiss v. Greenwood, inventions which are mere collection of "known" items are not considered patentable. In addition, substitutions which produce a better and/or cheaper product do not qualify the device for a patent.
A. & P. Tea Co. v. Supermarket Corp.
Under the court ruling in A. & P. Tea Co. v. Supermarket Corp., inventions which are combinations of "known" items are considered to be patentable, provided that the combination performs a new or different function, or that the changes made in the combination as compared to prior art are significant enough as to constitute an improvement worthy of patenting.
35 Section 103 Under Lyon v. Bausch & Lomb
1. Patent 3676638: Plasma Spray Device and Method (1972)
- There are significantly more pieces used to assemble the 1972 device than in the 1988 device
- The 1972 device takes the shape of a hand-held "gun" when fully assembled, whereas the 1988 device is meant to be used in an automated machine
- The material powder is inserted into the gas flow at an earlier point than in the 1988 device
- Plates with helical holes are used to drive the pattern of the flow of gas through the nozzle instead of creating a vortex
- The electric arc is created directly at the end of the cathode, rather than at the end of the nozzle in the 1988 device (which has "extended arc" in the patent title)
- The plasma spray gun can only spray powdered materials, whereas the 1988 device can spray both powders and wires/thin plates
- Geometries of the nozzles and internal cavities vary dramatically between the two devices
- The velocity of the gas/material in the 1972 device is significantly lower than in the 1988 device
2. Patent 4095081: Electric Arc Metal Spraying Devices (1978)
Summary of 1978 v. 1988: Some of the most prominent conditions which separate this device from the 1988 device are as follows:
- Two wires, which provide the material for spraying, are used as the anode and cathode that form the electric arc in the 1978 device, which differs vastly from the 1988 device
- The 1978 device can use only metal wires, whereas the 1988 device can use powders, wires, or thin plates
- The wires may be fed into the gas stream after the gas exits the nozzle, or an attached exit nozzle may be utilized in which the wires are fed into the gas stream before the gas leaves the system
Assessment Under Hotchkiss v. Greenwood
1. Under the court ruling of Hotchkiss, the court decided against using cheaper materials or better materials that resulted in better performance as a means to determine patentability. Because of this and the ruling that "combinations of known items" do not qualify as patentable, the 1988 device's patent would probably be considered invalid, since both devices perform essentially the same function and use essentially the same materials, despite the vast improvement in cost and performance the differences make between the 1972 and the 1988 devices.
Assessment Under A. & P. Tea Co. v. Supermarket Corp.
1. Under the court ruling of A. & P., the 1988 device would clearly be patentable, as the differences between the two devices present significant improvements in performance and cost.
Assessment Under 35 Section 103 Under Lyon v. Bausch & Lomb