The Canadian patent includes the word longitudinal, so Stan appears to have believed these waves were present in his spherical cavity, whether he understood that mechanism or not. In this day and age, the biggest impediment to understanding these waves is the rubber band analogy in which it is stretched, then relaxed, producing an expansion followed by a compression of the rubber along its length. What actually happens, according to the old school teachings, is that the rubber band is stretched a certain distance in a specific amount of time, held constant for an equal amount of time, then stretched some more. There is no relaxing, or recompression in the opposite direction.
From the perspective of the ether, the longitudinal wave has two parts, North Pole and South Pole. The first half of the wavelength is like a narrow band of ether curling around a line pointing in the direction of travel, while not overlapping on itself, but expanding a little as it travels. (Like a strip wrapped around a long narrow funnel, getting a little wider along its length). This is equivalent to a North Pole line of magnetic flux. At the half wavelength distance the magnetic polarity flips to South Pole polarity. But this doesn't mean the flux line reverses 180 degrees. Instead, the South Pole flux tips to the side, 90 degrees to the direction of travel. This causes the ether to rotate in place, with no travel. It's like a clock spring, turning in one direction and compressing as it absorbs the ether's North Pole momentum, then expanding as it rotates back in the other direction. This reaction counter rotation reconstructs a North Pole flux line, extending the longitudinal wave's travel.
An interesting thing about the North Pole curl is that it will accelerate charged particles which are within it. (This is what cause the extreme, short distance acceleration responsible for producing the solar wind). Stan presents his device as being capable of Mega Watt gas output, while the patent states that a very small amount of amps are required. To do that, the device would have to use Longitudinal Waves.