I'm aware of that patent and appreciate the patriotism, but it's really a completely different design from Hon Lik's e-cigarette. This comes up every so often, so I guess I'll give my opinion on it.
The fact that Gilbert's design does not produce a visible vapor is but one huge difference. The only similarities they have is that they are both battery-powered, cigarette-shaped and contain flavored nicotine. The interior components and what they produce are completely different. Gilbert's design is closer to a nicotine inhaler in function and I doubt it would have the same popularity as Hon Lik's design.
The idea is the same - a battery-powered, smokeless device to simulate smoking - but the executions are completely different. (Sort of how a "portable music listening device" can be a Walkman or an iPod. Same idea - portable music - but completely different ways to achieve it.) In Gilbert's design, the heating element is a tubular light bulb in the middle chamber. The battery is a tiny thing at the mouth end. The nicotine cartridge is at the opposite tip. The device is activated when the battery mouth piece is attached to the light bulb inside. The user inhales and (hopefully) the liquid in the tip will be drawn into the light bulb compartment, swirl around, get heated into moist air and then inhaled through the mouth piece. Then you'd have to unscrew the tip to turn off the light bulb. There is no visible vapor exhaled.
This is nothing like Hon Lik's design, so I do not consider Gilbert to be the "real" inventor of the e-cigarette we use today, anymore than Apple would likely put a Walkman in their product's timeline. The irony of that article stating "The whole patent issue becomes somewhat complicated when you consider new technology and different designs," is that the whole point of a patent is "different designs." Look at all of the early patents for "heavier-than-air flying machines." Yet, who is considered the inventors of the airplane? The Wright brothers, because their design is what actually worked and became the standard. Octave Chanute isn't considered the "real inventor" of airplanes, even though he came up with the the early designs upon which the Wright brothers based their experiments.
Gilbert may have had the idea of a battery-powered, smokeless cigarette first, but unfortunately, he didn't come up with anything close to what Hon Lik invented and there is no way of knowing if it would have even worked. In my opinion, Hon Lik rightfully deserves the credit as inventor of the e-cigarette.
Gilbert's design may be a footnote in the early history of seeking smokeless cigarette alternatives, but it is not a major contributor to the overall history of the e-cigarette.